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　　Can you imagine a world without the sun? Astronomers’ research shows that if there is no sun, the average surface temperature of the earth will drop to below-17.78 degrees Celsius in a week, and it will drop to-73.33 degrees Celsius in a year. Most plants will die in a few weeks, and then most life will disappear because of the disappearance of the sun, and everything will be dead.

　　Now we know how important the sun is to us! However, something unfortunate happened. Recently, foreign scientists’ research on the metal abundance of the sun shows that we may overestimate the life of the sun by one billion years, and the sun may die one billion years earlier than we expected.

　　Elemental abundance controls the sun’s life gate

　　It is understood that scientists have previously deduced that the life of the sun is about 10 billion years based on the standard solar model that ignores the rotation effect, which is a theoretical value simulated by the stellar evolution program, not a real value. And this value only refers to the central hydrogen combustion life in the theory of star evolution.

　　"This is not to say that the sun really can only exist for 10 billion years. The accurate statement should be called the main sequence life of the solar model. In theory, the sun will become a red giant in about 10 billion years, but it still exists and will emit more sunlight. " Associate Professor Yang Wuming from the Astronomy Department of Beijing Normal University told the Science and Technology Daily reporter.

　　He said that there are many preconditions to get the theoretical value of 10 billion years, and it is necessary to assume the initial element abundance of the sun and the physical process inside the sun. The life of the solar model is different with different initial element abundances. Because it is impossible to really get the initial element abundance of the sun and determine its internal physical processes, the life of the sun and even other stars cannot be accurately estimated.

　　Twenty years ago, astronomers’ direct and indirect measurements of the sun showed that the metal abundance of the sun was around 1.8%; However, the latest solar spectrum measurement shows that the metal abundance of the sun is only 1.3%, which is far lower than the previous measurement results, and correspondingly, the life of the sun will be reduced by 1 billion years.

　　The so-called solar metal abundance is the general term for the abundance of solar elements except hydrogen and helium. This metal is different from what we usually call metals. Because the contents of hydrogen and helium in the sun account for the vast majority, astronomers call all the heavier elements in the sun "metals". Although the content of these metals is small, it affects the fate of the sun.

　　Because the electrons of metal elements easily absorb photons, which hinders radiation, the higher the metal abundance of the sun or star, the higher the opacity. The opacity of the sun or star is closely related to its life, temperature, brightness and other properties. Sani Vaniotch, a physicist who studies solar metal abundance at Stockholm University in Sweden, said that a very small amount of metal is enough to completely change the behavior of a star, and metal abundance can basically tell you how the star will die.

　　Influence of atmospheric model on solar lifetime estimation

　　The solar spectral measurement used in the latest research usually means that astronomers get the spectral lines of all measurable elements such as hydrogen, carbon, nitrogen, oxygen and iron through solar spectral analysis, and then compare them with the spectral lines given by the solar atmospheric model. When the two are consistent, the abundance of elements such as hydrogen, carbon, nitrogen, oxygen and iron used in the atmospheric model is considered as the element abundance of the solar photosphere. "However, this method cannot obtain the relative abundance of inert gases such as helium, neon and argon. The abundance of helium on the surface of the sun can only be inferred by helioseismology. " Yang Wuming said.

　　After the latest measurement results come out, many people are wondering: Why is there such a big difference between the solar metal abundance measured before and after?

　　In this regard, Yang Wuming explained that the old solar metal abundance was derived from the one-dimensional atmospheric model of local thermal balance combined with the observed spectral lines; The new solar metal abundance is derived from the three-dimensional atmospheric model of non-local thermal balance combined with the observed spectral lines. The old one-dimensional atmospheric model is considered to ignore many physical factors. Some scientists think that the new atmospheric model is closer to the real situation, and it is the improvement of the atmospheric model and the update of the transition probability data of atoms and molecules that cause the difference in the abundance of old and new metal elements.

　　In the evolution of stars, if other conditions remain unchanged, the decrease of metal abundance will lead to the energy generated by the central nuclear reaction radiating outward more easily. However, the energy tends to radiate outward, which will cause the star to contract more easily and increase the density and temperature of the center of the star. More importantly, the increase of density and temperature will accelerate the hydrogen combustion rate, which will lead to the shortening of the total time of central hydrogen combustion, that is, the main sequence life of the solar model will be shortened. However, if other conditions change, such as the increase of hydrogen abundance or the influence of the sun’s rotation on its evolution, then the aforementioned life reduction does not exist.

　　So, how to verify which method is more correct in the future?

　　In Yang Wuming’s view, the answer to this question lies in which metal abundance measurement is more accurate and whether the helioseismology inversion result is reliable. Only by giving the correct abundance of solar elements can we determine how long the life of the sun is. If we can give a new solar model of gold abundance consistent with the helioseismology inversion results, all related problems will be solved.

　　Life geometry is related to the theory of stellar evolution.

　　Chen Pengfei, a professor at the School of Astronomy and Space Science, Nanjing University, said that he was inclined to think that the initial life span of the sun was correct, and the life span of the sun would not be reduced by one billion years. "For several reasons, I prefer to think that the original model is correct: first, the measurement results of metal abundance in the solar wind by satellites support 1.8%; Secondly, the density of photosphere on the surface of the sun is high enough, so it is reasonable to adopt the approximation of local heat balance model in the past; Thirdly, the new model takes into account the inhomogeneity of the solar atmosphere, which is indeed an improvement, but it also ignores other factors, such as the influence of magnetic field; Fourth, to take a step back, even if the results of the new model are correct, because the distribution of metal abundance may be uneven, the metal abundance on the surface of the sun may be different from that inside. " Chen Pengfei said.

　　At the same time, Yang Wuming also agrees that the initial solar life is correct. He said that the life of the sun has not been overestimated by 1 billion years, and that the life of the sun is overestimated because only the reduction of metal abundance is considered. When the influence of hydrogen abundance increase and rotation on the evolution of the sun is considered, the life of the sun will not be reduced.

　　However, the astrophysicist Martin asp Lund of the Australian National University insists that the 1.3% solar metal abundance is correct. He said that all aspects of astronomy will be affected, and an accurate understanding of the evolution of stars has laid the foundation for almost everything.

　　So, if astronomers do overestimate the life of the sun by one billion years, what theories need to be revised?

　　In Yang Wuming’s view, if the life of the sun is really overestimated by 1 billion years, it shows that the theory of stellar evolution established by astronomers before is not complete, so they need to re-examine the theory and model of stellar evolution established before. For example, the standard theory of star evolution ignores the influence of star rotation, but in fact all stars are rotating. We have reached the time when we need to seriously consider the influence of rotation on the evolution of stars. Astronomical research on star clusters and galaxies depends on the theory of stellar evolution to a certain extent. If the theory of stellar evolution is wrong, the previous understanding of star clusters and galaxies needs to be adjusted.

　　BEIJING, Feb. 20 (Xinhua) Title: [Ten Scenes of Spring Festival] People in China don’t smell firecrackers to protect the environment for the New Year.

　　Reporter Zhang Ni

　　Today is the fifth day of the first month, and there is a custom of setting off firecrackers to welcome the God of Wealth in China. This day is also the peak of setting off fireworks after New Year’s Eve. However, with the introduction of measures to ban and restrict release in recent years, many cities have become much quieter this Spring Festival. During the Spring Festival when firecrackers are not heard, people’s understanding of the old customs is also changing.

　　It is forbidden to put off firecrackers during the Spring Festival in many places.

　　During the Spring Festival this year, many places, including Tianjin and Beijing, imposed strict restrictions on the discharge of fireworks and firecrackers, and the bans issued in some places were even dubbed "the strictest in history" by the media.

　　For example, Tianjin stipulates that from January 1, 2018, fireworks and firecrackers will be prohibited in areas within the outer ring road of Tianjin (including the outer ring road) regardless of time and place. This regulation is also known as the "most severe prohibition order".

　　Beijing, on the other hand, resumed the "prohibition order" this year after experiencing the transition from "prohibition" to "restriction". According to the newly revised "Regulations on the Safety Management of Fireworks and Firecrackers in Beijing", it is forbidden to set off fireworks and firecrackers in the Fifth Ring Road of Beijing, and fireworks sales points are not set up.

　　Langfang, Hebei Province stipulates that starting from 2018, fireworks and firecrackers are prohibited in Langfang City and counties (cities) under its jurisdiction at any time of the year. During the Spring Festival, it is also forbidden to sell and set off fireworks and firecrackers in the Third Ring Road of Shijiazhuang City.

　　In Shanghai, this year is the third year that the city has implemented fireworks control. During the Spring Festival on New Year’s Day in Shanghai this year, there are more forbidden areas for fireworks and firecrackers than before, and the control is stricter.

　　In addition to prohibiting the discharge of fireworks and firecrackers within the Outer Ring Road in accordance with local legislation in Shanghai, on the basis of the scope of prohibition delineated in 2017, all districts outside the Outer Ring Road have added "high-rise buildings and buildings with low fire resistance using flammable and combustible external wall insulation materials" as prohibited places.

　　In addition, 17 cities in Shandong Province, except Zibo, Zaozhuang, Tai ‘an, Rizhao, Linyi and Laiwu, all the other 11 cities have issued policies to restrict release and prohibit release.

　　Firecracker sales are cold, and sales outlets in Beijing and other places have shrunk dramatically.

　　The reporter noted that the sales of fireworks and firecrackers have also changed in recent years, and the sales of fireworks and firecrackers in many places have been "cold".

　　According to the data released by the Beijing Municipal Government Fireworks Office in February 2017, the sales volume of fireworks and firecrackers in Beijing has been declining continuously since 2012. In 2017, the sales volume of fireworks and firecrackers in the city decreased by 30.5% year-on-year.

　　During the Spring Festival of 2018, there were 87 fireworks and firecrackers sales outlets in Beijing, down 82.97% year-on-year. There were no sales outlets in the Fifth Ring Road and the forbidden areas designated by various districts.

　　In addition, a total of 75,000 boxes of fireworks and firecrackers were stocked in Beijing during the Spring Festival this year, which was 55.9% lower than that in 2017. All large, medium and small combined fireworks and beading fireworks and firecrackers were all listed as prohibited sales.

　　Zou Yonghong, secretary-general of Shandong Fireworks and Firecrackers Association, told the media a few days ago that at present, fireworks and firecrackers are banned in Jinan, and most cities in the province impose restrictions on fireworks and firecrackers. The discharge and sales of fireworks and firecrackers in the main city have declined. Jinan, Qingdao and Yantai have dropped by 70% in recent five years.

　　In Shanghai, there are only nine fireworks outlets in Shanghai this year, and each outlet is expected to invest 300 boxes, which is further lower than the total of 3,000 boxes last year. The variety is limited to firecrackers and Gaosheng. In addition, the principle of real-name purchase is still strictly implemented.

　　What do the people think about not shooting during the Spring Festival?

　　What do the people think about the ban and restriction regulations in recent years?

　　In 2017, a survey of residents in 35 major cities conducted by the Public Opinion and Public Opinion Research Center of Shanghai Jiaotong University showed that when asked, "In order to prevent air pollution, the Chinese government should ban firecrackers and fireworks during the Spring Festival. What is your opinion?" At that time, as many as 80.8% of the people said that they "basically agreed" or "strongly agreed" to ban fireworks and firecrackers during the Spring Festival, which was 16.8 percentage points higher than the survey results in 2015.

　　"In fact, before the ban was implemented, I could feel that fewer people were shooting during the Spring Festival. I haven’t shot for many years myself." Chen Tingting, a post-80s generation who grew up in Beijing, said in an interview.

　　Chen Tingting remembers that when Beijing just changed from a ban to a restriction, firecrackers kept ringing in the neighborhood almost all night on New Year’s Eve, but there was hardly such a scene in recent years.

　　"Setting off firecrackers in the Spring Festival is a childhood memory of many post-70 s and post-80 s, but many children younger than me may not be so enthusiastic, and everyone’s entertainment methods are becoming more and more diverse. In addition, the smog in Beijing in winter has been more serious in recent years, and people’s awareness of environmental protection is also improving. Many people actively choose not to set off firecrackers." Chen Tingting said.

　　At the same time, the implementation of the ban policy has also triggered a heated discussion on the Internet, and many netizens also support it.

　　"It’s better not to put it away. The electronic cannon I bought from Da Hutong two days ago is environmentally friendly and saves money, saves trouble and worries (I’m afraid that the cannon will blow my hands)." Netizen @O greatly greatly greatly Qian Qian said.

　　"You put a whip and he put a box of guns, and every little makes a mickle, which forms pollution. Civilize the Spring Festival and let good air accompany us." Netizen @fun4 entertainment anchor commented.

　　However, some netizens think that the "prohibition order" dilutes the "taste of the year" and give their own suggestions for the "prohibition order".

　　For example, the netizen @ Gaofeng Ben Si put forward: "Don’t let everyone shoot, will the government organize several places to set off the previous celebration fireworks?" Add some joy to the festival. "

　　What does the government encourage to change customs and do without setting off firecrackers?

　　At the same time, in recent years, many local governments have also promoted changing customs and encouraging people to celebrate traditional festivals in a more environmentally friendly way.

　　It is mentioned in the Regulations of Shanghai Municipality on the Safety Management of Fireworks and Firecrackers that "it is encouraged to change customs and promote the use of safe and environmentally friendly alternative products such as electronic firecrackers and fireworks containers".

　　This year, environmental protection departments in many areas also issued initiatives before the festival.

　　Anhui Provincial Environmental Protection Department issued a proposal, hoping that leading cadres at all levels in party member would set an example, consciously take the lead in not buying or setting off fireworks, and at the same time guide and motivate people around them to actively respond to the proposal and do a good job in banning fireworks.

　　The proposal also calls on citizens to advocate the concept of environmental protection, change traditional ways, choose low-carbon environmental protection methods such as electronic firecrackers, festive music and flowers, be friendly to the environment and say "no" to pollution.

　　The proposal issued by the Department of Ecological and Environmental Protection of Hainan Province puts forward that "Party and government organs, enterprises, institutions and their staff at all levels in the province take the lead in setting an example, taking the lead in not setting off fireworks and firecrackers, and driving the whole society to form new festivals and customs that advocate environmental protection."

　　During the Spring Festival this year, Chen Tingting’s family did not buy fireworks as in previous years, but bought Spring Festival couplets, window grilles and other new year’s goods early, and decorated the room completely.

　　In the past two years, in addition to cleaning and decorating the room and preparing for the New Year’s Eve, she and her family have another pastime, that is, grabbing red envelopes, which they enjoy every year, and the whole family goes into battle together.

　　"Although I can’t grab much money, I think it’s quite fun. Maybe times have changed, people’s holiday habits will also change, and maybe grabbing red envelopes will become ‘ Annual customs ’ Yes. " Chen Tingting said. (End)

　　Beijing, April 14 (Xinhua) According to the website of the Ministry of Industry and Information Technology, the Ministry of Industry and Information Technology recently released the economic operation of the automobile industry in March 2020. The data shows that in March, the production and sales of automobiles were 1.422 million and 1.43 million respectively, down by 44.5% and 43.3% respectively. From January to March, the production and sales of automobiles were 3.474 million and 3.672 million respectively, down by 45.2% and 42.4% respectively.

　　According to reports, in March, 2020, with the phased results of epidemic prevention and control in COVID-19, auto companies accelerated their resumption of work and production, production and operation resumed in an orderly manner, and the auto market gradually picked up, but the overall production and sales were still at a low level.

　　Car sales in March decreased by 43.3% year-on-year.

　　In March, the production and sales of automobiles were 1.422 million and 1.43 million respectively, down by 44.5% and 43.3% respectively.

　　From January to March, the production and sales of automobiles were 3.474 million and 3.672 million respectively, down by 45.2% and 42.4% respectively.

Image source: website of Ministry of Industry and Information Technology

　　— — In March, passenger car sales decreased by 48.4% year-on-year.

　　In March, the production and sales of passenger cars were 1.049 million and 1.043 million respectively, down by 49.9% and 48.4% respectively. In terms of vehicle types, the production and sales of cars were 493,000 and 491,000 respectively, down by 50.3% and 48.6% respectively. The production and sales of SUVs were 498,000 and 485,000 respectively, down by 44.8% and 43.9% respectively. The production and sales of MPV were 35,000 and 46,000 respectively, down by 77.3% and 70% respectively. The production and sales of crossover passenger cars were 22,000 and 21,000 respectively, down by 48.6% and 58.2% respectively.

　　From January to March, the production and sales of passenger cars were 2.684 million and 2.877 million respectively, down by 48.7% and 45.4% respectively. In terms of vehicle types, the production and sales of cars were 1.233 million and 1.325 million respectively, down by 50.4% and 47.6% respectively. The production and sales of SUVs were 1.288 million and 1.372 million respectively, down by 43.1% and 39.6% respectively. The production and sales of MPV were 114,000 and 136,000 respectively, down by 70.4% and 63.3% respectively. The production and sales of crossover passenger cars were 49,000 and 45,000 respectively, down by 51.1% and 54.1% respectively.

Image source: website of Ministry of Industry and Information Technology

　　In March, China brand passenger cars sold 433,000 vehicles, down 48.2% year-on-year, accounting for 41.5% of the total passenger car sales, and its share increased by 0.2 percentage points year-on-year.

　　From January to March, the cumulative sales of China brand passenger cars was 1.155 million, down 47.3% year-on-year, accounting for 40.1% of the total sales of passenger cars, and the share decreased by 1.5 percentage points year-on-year. Among them, the sales volume of cars was 265,000, down 48.7% year-on-year, with a market share of 20.1%; The sales volume of SUVs was 752,000 units, down 41.3% year-on-year, with a market share of 54.8%. MPV sold 91,000 vehicles, down 69% year-on-year, with a market share of 67.2%.

　　— — Commercial vehicle sales in March decreased by 22.6% year-on-year.

　　In March, the production and sales of commercial vehicles were 373,000 and 388,000 respectively, down by 20.3% and 22.6% respectively. In terms of vehicle types, the production and sales of trucks were 341,000 and 357,000 respectively, down by 20.3% and 22.1% respectively. The production and sales of passenger cars were 32,000 and 31,000 respectively, down by 20.9% and 28% respectively.

　　From January to March, the production and sales of commercial vehicles were 790,000 and 794,000 respectively, down by 28.7% and 28.4% respectively. In terms of vehicle types, the production and sales of trucks were 721,000 and 728,000 respectively, down by 29.3% and 28.2% respectively. The production and sales of buses were 69,000 and 66,000 respectively, down by 22.9% and 30.7% respectively.

Image source: website of Ministry of Industry and Information Technology

　　In March, the sales of new energy vehicles decreased by 53.2% year-on-year.

　　In March, the production and sales of new energy vehicles were 50,000 and 53,000 respectively, down by 56.9% and 53.2% respectively. In terms of vehicle types, the production and sales of pure electric vehicles were 38,000 and 40,000 respectively, down by 58.5% and 55.6% respectively. The production and sales of plug-in hybrid vehicles were 11,000 and 13,000 respectively, down by 50.2% and 44.1% respectively. The production and sales of fuel cell vehicles were 38 and 36 respectively, of which the output increased by 5.6% year-on-year, and the sales volume was the same as the same period.

　　From January to March, the production and sales of new energy vehicles were 105,000 and 114,000 respectively, down by 60.2% and 56.4% respectively. In terms of vehicle types, the production and sales of pure electric vehicles were 77,000 and 85,000 respectively, down by 61.8% and 58.6% respectively. The production and sales of plug-in hybrid electric vehicles were 28,000 and 29,000 respectively, down by 55% and 48.5% respectively. The production and sales of fuel cell vehicles were 183 and 207 respectively, down by 19.7% and 7.2% respectively.

Image source: website of Ministry of Industry and Information Technology

　　From January to February, the main business income of key enterprises decreased by 32.8% year-on-year.

　　From January to February, the main business income of key enterprises (groups) in the automobile industry totaled 382.7 billion yuan, down 32.8% year-on-year; Accumulated profits and taxes totaled 21.16 billion yuan, down 65.1% year-on-year.

　　Automobile exports increased by 0.8% year-on-year in March.

　　In March, 91,000 vehicles were exported, a year-on-year increase of 0.8%. In terms of models, the number of passenger cars exported was 68,000, a year-on-year increase of 21.9%; The number of commercial vehicles exported was 23,000, a year-on-year decrease of 33.8%.

　　From January to March, 204,000 vehicles were exported, down 11.5% year-on-year. In terms of models, the number of passenger cars exported was 154,000, a year-on-year increase of 5.3%; 50,000 commercial vehicles were exported, down 40.7% year-on-year.

Zeng Qiuju and community workers publicized the knowledge of epidemic prevention and control.

　Deng Xiaohu, a community doctor, helped the residents to do a detailed examination.

"If we climb one more floor, we can reduce the possibility of virus transmission." "If we buy more, we can guarantee the supply of food baskets for everyone." Community prevention and control is the first line of defense against the epidemic in COVID-19. In the past few days, the "most beautiful retrograde" around us has been jointly controlled and fearless in the epidemic, building a safety barrier.

Work together to overcome the difficulties. In this epidemic, community secretaries, volunteers, retired people, caring people, drivers, etc. appeared in every corner of urban and rural areas, and became a warm-hearted force in prevention and control.

Sanxiang Metropolis Daily reporter Bu Lan reports.

Community epidemic prevention personnel:

Grandpa died of illness, and he fought back his grief and went to work.

"Resolutely win the epidemic prevention and control war!" On January 29th, in Xiufeng Sub-district Office, Kaifu District, Changsha City, party member Commando, composed of 49 party member, made a solemn oath. Yao Jing, the vice captain standing in the front row, has a firm eye, but everyone doesn’t know that his elderly grandfather in his hometown is dying.

On January 28th, more than 30 Hubei guests stayed in a designated hotel in Xiufeng Street. Street commandos entered the hotel as quickly as possible. After Yao Jing was busy, she arranged for the team members to take turns on duty and do a good job in prevention, control and service. Because he is in charge of the health line among the members of the street team, from the New Year’s Eve, he has been involved in the epidemic prevention work all the time, going deep into the house-to-house investigation of the community and turning around for several days. However, at noon on January 29, the most feared news came, and grandpa left this world.

"The most kind smile never see again, I’m sorry! Grandpa walked all the way! " After writing this passage in a circle of friends, Yao Jing held back her sadness and devoted herself to the frontline epidemic prevention work.

Community aunt:

Changing patterns to supplement nutrition for front-line workers

"Since the New Year’s Eve, the community has been posting notices in the community. The staff eat instant noodles every day and work overtime until midnight. I really feel sorry for them. " Zeng Qiuju, who lives in Lifa New Town Community, Muyun Street, Tianxin District, Changsha, said that although he has retired, he also wants to do something for the community.

From January 30th, every morning at 8: 00, Zeng Qiuju, 57, will go to the nearby supermarket to buy food early. After coming back to disinfect the kitchen, he will start cooking rice to ensure that five dishes and one soup can be served on time at 12 noon.

Zeng Qiuju will cook in a variety of ways according to everyone’s preferences, such as bean paste, fried radish skin with bacon, stewed chicken, seaweed and egg soup, etc. After cleaning up the dishes and chopsticks, Zeng Qiuju will go with the community workers to check the epidemic prevention situation in the jurisdiction, such as registering the business situation of surrounding stores, community disinfection, epidemic prevention publicity and so on.

Community doctor:

Crush one’s head and extract specimens for suspected objects

Since January 22, Deng Xiaohu, deputy chief physician of Qingyuan Street Community Health Service Center in Tianxin District, Changsha City, has been working, visiting households, checking and monitoring every day, publicizing protection knowledge, and walking in a hurry.

Deng Xiaohu visits more than 10 families every day. Once the suspected person is found, it is necessary to take his temperature, ask about the contact history, guide the matters needing attention, register it, and carry out dynamic monitoring.

At 9 o’clock on New Year’s Eve, he received an urgent call. A girl in her twenties needed medical observation because she was taking care of her grandmother who was diagnosed in novel coronavirus. "After I put on protective clothing, I was sweating all over, and even my goggles were water mist. In this case, it is very easy to be infected to extract secretions from the throat of the suspected object. At that time, it was really hard on the scalp. "

Community police: I had a special "reunion dinner" with my family through video.

On January 24th, New Year’s Eve, Yan Xiaodan, a community policeman at the vault police station of Yuhua Public Security Bureau in Changsha City, and his wife, elderly parents and young daughter who couldn’t go home at the same post had a special "reunion dinner" through WeChat video.

Yan Xiaodan’s wife is a pediatrician in the Provincial People’s Hospital. She went to the front line years ago and hasn’t come home yet. As a community policeman, since New Year’s Eve, Yan Xiaodan has been carrying out epidemic prevention propaganda in the community and checking the personnel and vehicles in the jurisdiction, cleaning up the entertainment places and mahjong halls that are still open in the jurisdiction, and has been on duty for several days.

The epidemic was urgent, and both husband and wife were fighting at the front. When thinking about his family, Yan Xiaodan can only report his work status to his family through WeChat video connection and encourage each other. "Since our husband and wife are engaged in this profession, we must undertake the mission entrusted to us by the profession."

Community driver: Take a cot and get ready to drive at any time.

On January 26th, Lei Dongqiang went to the Eden Medical Park to purchase protective supplies and disinfection materials. It was past 6 pm when he returned to the unit to unload the materials and do the daily maintenance of the ambulance. He hurriedly ate a bucket of instant noodles and stood by in the hospital. At 10 o’clock that night, he received a temporary emergency task and went to the high-speed exit to be on duty. Lei Dongqiang rushed to the high-speed exit, and it was an all-night stay.

Lei Dongqiang, a 67-year-old ambulance driver, is an old party member in Xiufeng Street Community Health Service Center, Kaifu District, Changsha. His daily work is the ambulance driver and the water and electricity maintenance of the unit. In the past few days, in order to be able to set off at the first time after receiving an urgent task, Lei Dongqiang set up a temporary bed directly in the health cabin of the main building and rested on this simple bed at night so as to get out at any time.

Fixed-point service hotels, high-speed exits and referral of suspected cases open to people in epidemic areas also need to cooperate with various communities to investigate the situation of returning people in Wuhan. Lei Dongqiang is always on call, taking everyone around every place.

Community caring people: drive 300 bags of vegetables for free every day.

"Pollution-free vegetables are collected free of charge, and the virus is heartless and affectionate. We will work together to fight the epidemic." On the morning of February 12th, Wang Zihao drove a van full of vegetables that had just been picked from vegetable fields, and sent them from Gao Qiao Town, Changsha to Xingshacheng District, Changsha County for citizens to collect for free.

Wang Zihao, 25, retired from the army last September and returned to Weihan Village, Gao Qiao Town. He is going to open a fast food restaurant in Xingshacheng District this year. In the early stage, he planted a few acres of side dishes in his hometown. "Now there are many side dishes at home, but at present, the store can’t be opened, so he has the idea of delivering vegetables."

From February 8th, he picked and packed vegetables with his parents every day, prepared about 300 bags, and then drove for an hour from Gao Qiao Town to Xingshacheng District for the citizens to collect. "It’s my regret that I retired early and couldn’t fight with my comrades. I can only do my best to do something meaningful at this critical moment." Wang Zihao said.

Community retired elderly: 70-year-old party member led 21 members to fight the epidemic together.

"Huang Miao, you have come back from shopping. Come on, spray your hands with alcohol first, and take your temperature before entering the community." "Brother Zhao, remember to wear a mask when you go out!" "Fat Dad" Chen Yunxiang greeted the residents at the gate of the community while busy doing various epidemic prevention propaganda work.

On the first day of epidemic prevention and control work in Tangjialing community of Changsha, he volunteered to participate in the prevention and control war "epidemic". "I am a party member, even if I am 70 years old, I am still a party member, and I will take protective measures."

From the beginning of the circulating broadcast of mobile speakers to the distribution of warm tips, epidemic prevention notices and posting notices to residents, "Fat Dad" has to walk more than 10 kilometers every day for inspections. Moreover, he also led 21 players to join the "epidemic". "We set up a volunteer team last year, and now it just comes in handy!"

Support

Psychological stress in community work?

Try to do this!

The data shows that nearly 4 million urban and rural community workers are fighting in the front line of epidemic prevention and control in 650,000 urban and rural communities, and each community worker has to face 350 people. So, how should community workers do psychological debugging?

Insiders suggest that we should protect ourselves first. If you are under great pressure at work or have important things at home, you should communicate with your colleagues and superiors in time, and you can stop working or rotate your work if necessary. If you can’t adjust yourself well, you can also call the psychological assistance hotline for professional help. If you can’t control your worries, try to divert your attention and find something that you can devote yourself to for a long time to change your fear.

At the same time, you can often soak your feet with hot water and listen to soft music to relax and ensure adequate sleep.

Original literature and history Jun Haoran literature and history

There are two boys serving tea in the front of (part of) Yan Yin Tu in Tang Dynasty.

An archaeological report published by the archaeological team of Shandong University officially announced the discovery of the world’s earliest tea in the ruins of the ancient city of Guo in Zoucheng, Jining, Shandong. Prior to this, the earliest tea in the world was found in the burial pit of Yangling, Emperor Liu Qi of the Han Dynasty. This discovery of Shandong University directly pushed the historical upper limit of tea drinking in China for more than 300 years. Tea, as a kind of drink, has entered the daily life of China people for a long time. With the development of history, not only tea itself and its related material forms have been developed, but also tea has entered the spiritual world of China people and become a sustenance of the elegant people. When the tea inscription meets the ancient paintings, those long-gone tea events are vividly presented in front of us. Let’s follow these ancient paintings to see the tea events in China!

Tea found in the ruins of the ancient city of Guo in Zoucheng, Jining, Shandong Province

I. Tea Affairs in Tang and Song Dynasties

China people’s acceptance of tea is a gradual process. Legend has it that tea originated from Emperor Yan Shennong, but at this time it was used as a medicinal drink. In the Warring States period, people in China had drunk tea. In the Han Dynasty, tea was still used as a medicine or food to participate in people’s lives.

The earliest and most reliable record of tea can be found in "Tong Yue" written by Wang Bao of Sichuan in the Western Han Dynasty. It records what a servant should do every day, and one of them is "brew tea does everything … Wuyang buys tea". Later, tea pots engraved with the word "tea" in the Eastern Han Dynasty were unearthed in Zhejiang and other places. This shows that tea has been quite popular in the Han Dynasty.

Although there were sporadic records about tea in Wei and Jin Dynasties, the tea culture at this time was still in a hazy period. Tea culture gradually surfaced, not only in ancient paintings, but also in systematic records, starting from the Tang Dynasty. The Classic of Tea by Lu Yu, a native of Tang Dynasty, is the first monograph on tea culture in the history of China, while The Orchid Pavilion of Xiao Yi is the first ancient painting with brew tea in the history of our country.

The Song Dynasty’s Copy of Xiao Yi Earning Lan Ting Tu, which was anonymous in Tang Dynasty.

The popularity of tea in the Tang dynasty was recorded in detail in the sealed "Feng’s Experience". It is said that during the Kaiyuan period, a monk in Lingyan Temple in Taishan forgot to eat and sleep in order to study Zen, and he relied on drinking tea to eliminate his fatigue and hunger. After the news spread, it became a custom to follow suit. From Shandong to Chang ‘an, the then capital city, and Chasiying Street, the world could beg for a cup of tea as long as it invested money.

After the publication of Lu Yu’s Tea Classics in Tang Suzong, tea culture gradually became an art, which was favored by ministers and nobles. "When the tea ceremony is popular, all princes and courtiers will drink.".

"Wu Mei Niang Legend" Tea tasting in upper class

A picture of Gong Le Tu in the Tang Dynasty depicts twelve beautiful women playing music around the table. They are holding pipa, guzheng, sheng and other musical instruments. There is a big tea basin on the table, and a maid-in-waiting is taking tea from the tea basin and giving it to everyone. A beautiful woman is making a drink, which shows that tea has become an essential thing for these princes and nobles to have fun every day.

Gong le tu in Tang dynasty

According to Lu Yu’s Book of Tea, people in the Tang Dynasty can be divided into boiled tea, nunnery tea and tea. In the Tang dynasty, people also called boiling tea fried tea. Although their names are different, their methods are generally the same. Use a "tea pot" or "tea kettle" for "boiling tea". After the tea is cooked, you need to use a tea spoon to take it to other places. The "fried tea" uses "tea pan", and after the tea is cooked, it can flow directly from the spout to the container.

Temple tea is now brewed directly with boiling water, while tea is special. In the Tang Dynasty, people mixed tea and porridge into a kind of tea porridge, and this drinking method was called "porridge".

"Xiao Yi Earns Lanting Map" Part

The painting "Xiao Yi Earns Lanting Map" tells the story of Xiao Yi defrauding Lanting Preface from the debating machine for Emperor Taizong. In the lower left corner of the painting, there is a stove boiling tea, and an old man is squatting on the ground, holding a bamboo pod and stirring the tea powder in the tea pot. The old man is on his back, his nostrils are enlarged, and he seems to appreciate the rich tea fragrance. While another teenager is holding a black lacquer lamp holder and a white porcelain bowl, leaning over and waiting to pick up the tea that is about to be fried. The instrument used by the old people to cook tea is a tea jar. After the tea is cooked, it can be poured directly into the tea cup offered by the young people. This way of frying tea was a common way in the Tang Dynasty. Besides, we can also see tea-making tools such as saucer, tea mill and tea combination in this painting.

The image expressed in "Xiao Yi Earns Lanting Map" itself is that guests come to cook tea, which inadvertently reflects the skills and related tools of tea cooking in Tang Dynasty, and shows that the method of tea cooking in Tang Dynasty has reached maturity and entered people’s daily life. It is in line with Lu Yu’s sentence: "When you are immersed in the customs, it is prosperous in the country, and the two capitals are between Jing and Yu, thinking that it is better than drinking in the house."

The maid on the left side of Tang Zhou Fang’s "Tune the piano and compose the tea" serves tea.

Song people are better at tea than Tang people, but they have the habits of Song people. Tea was divided into "piece tea" and "loose tea" by Song people. "Piece tea" is a cake that has been squeezed into cakes, while "loose tea" is tea that has not been squeezed. However, Song people like tea powder, that is, grinding tea into powder, so whether it is "piece tea" or "loose tea", it is actually tea powder.

Because of the different forms of tea, the way of drinking tea in Song Dynasty was different from that in Tang Dynasty. Tang people like to "make tea", while Song people like to "order tea". The so-called "tea-ordering" means putting the tea powder in a tea cup, adding soup to it with a tea bottle, and finally stirring the tea powder. "Ordering" also means drip. This process seems simple, but it is actually very learned. The appearance of ordering tea, a way of drinking tea, also led to the emergence of a competition about tea cooking in Song Dynasty-fighting tea.

Prepare tea map

Tea fighting, also known as "tea fighting", has several processes. At first, it is necessary to iron the tea cup, and then "paste mixing", that is, pour the tea powder into the tea cup. The most important process is to pour boiling water and stir the tea leaves with teaspoons and tea baskets. Especially when mixing with a tea basket, we should pay attention to the priorities. After mixing a bowl of good tea soup, the foam floating on the surface should be evenly spread and the foam should be close to the tea cup, which is called "biting the cup". However, if the foamed camellia is not evenly spread to reveal a gap, then the mixing fails, which is called "cloud foot scattering" or "water foot scattering".

In the Song Dynasty, we can see several people in folk costumes squatting and fighting for tea, which is a good picture of folk fighting for tea.

Song dynasty’s anonymous "dou cha tu"

Generally speaking, not all tea leaves will use tea in this way. Song Wangguan said in "Learning Forest" that "the best of tea is to sip it; Those who fry and sip it are all common ",that is to say, good tea will use the way of ordering tea, and ordinary tea will still be used to fry tea." But in fact, almost everyone in the Song Dynasty used some tea when drinking tea.

Song people like tea, from the emperor or the public to the common people. Song Huizong once painted a picture of Wen Hui Tu, which was about the literati’s elegant collection of tea. The lower part of the painting depicts several waiters waiting for soup and ordering tea, showing the literati’s love for ordering tea at that time. In addition, in order to meet their own demand for tea, the royal family in the Northern Song Dynasty specially sent a transshipment ambassador to Beiyuan, Fujian Province to make tribute tea, with the name "Dragon and Phoenix Tuancha". Song Huizong once praised it as "Dragon and Phoenix Tuancha, which is famous in the world", and even wrote "Daguan Tea Theory" himself, becoming the only emperor in China history who personally wrote the tea theory.

Wen Hui Tu by Song Huizong in Northern Song Dynasty (partial)

In the masterpiece The Riverside Scene at Qingming Festival, we can find tea shops everywhere in the bustling Bianjing street, which became the most important place to meet the material and spiritual needs of the citizens in the Northern Song Dynasty.

Song Zhang Zeduan’s Riverside Scene at Qingming Festival (partial)

Second, tea affairs in Yuan, Ming and Qing Dynasties

The Yuan Dynasty was a dynasty established by Mongolian ethnic minorities. Because of the difference in diet, the Mongols were not very interested in drinking tea. In addition, the country of the Yuan Dynasty was not very long, so the drinking habits of the Yuan Dynasty basically followed the way of drinking tea in the Song Dynasty. However, the Yuan Dynasty was a transitional stage. At that time, there was a tea-making method of "soaking soup to remove smoke and decocting it with soup" in the south, which was basically consistent with the tea-drinking method in the Ming and Qing Dynasties.

Yuan mural Dao Tong

By the Ming Dynasty, there had been another great change in the way of drinking tea in China. Because the manufacturing process of tea powder is complicated, Ming Taizu officially abolished the tribute tea in Fujian in the Song Dynasty in the 24th year of Hongwu, and changed the tea powder to make tea. The form of tea was formally changed from group tea and cake tea to loose tea, which led to the general way of making tea now. Tea powder was abandoned, and the method of ordering tea was naturally abandoned. Over time, people in the Ming Dynasty did not know what the method of ordering tea was.

Xu Cishu, a Ming Dynasty man, recorded the way of making tea in Tea and Vegetables Cooking Point: "First, hold tea in your hand, once the soup is put into the pot, throw the tea soup at hand, and cover it with a lid. When you breathe three times, you will pour it into the pot again." Although the Ming people still pay attention to the first tea soup for washing tea and the second for drinking, this way of making tea has been much simpler than the tea frying method in Tang Dynasty and the tea ordering method in Song Dynasty.

Ming anonymous "tea tasting map"

In Wen Zhiming’s Tea Tasting Map, we can see a grass hiding under a tree, two people sitting opposite each other in the cottage, a teapot and two white porcelain teacups on the middle desk, and a boy cooking water in the side room. Tea drinking is born with a quiet temperament. Drinking tea in downtown is lively, but in such an environment as painting, tea drinking pays attention to quietness, and it is the most desirable way for scholars in Ming Dynasty to discuss tea in quietness. Zhang Yuan, a Ming Dynasty scholar, said in Tea Record: "Drinking tea with few guests is more expensive, but many guests are noisy, and noisy is lacking in elegance." It can be seen that the tea drinking of Ming scholars is a static word, which also gives a different sustenance to tea tasting.

Tea Tasting Map by Wen Zhiming in Ming Dynasty (partial)

When we compare this picture with the Song Dynasty’s "Dou Cha Tu" mentioned before, we will find that with the disappearance of tea powder and tea ordering, tea sets have been simplified, and the tools needed for drinking tea in the Song Dynasty, such as tea grinders, teaspoons and tea baskets, are no longer popular, so that scholars in the middle and late Ming Dynasty will be confused when they read the tea baskets written by Song people.

Tea basket

Although the procedures for drinking tea and tea sets have been simplified, the quality of life of the literati in Ming and Qing dynasties has not decreased at all. They have played new tricks on the remaining teapots, teacups and tea cans, and the tea sets in the Ming and Qing dynasties are more exquisite and exquisite.

Teapots in the two dynasties were made of purple clay pots, and Wen Zhenheng, a Ming dynasty, said in "Chronicles of Long Stories" that "the teapot is made of sand, and the cover is neither fragrant nor cooked." Ming people also prefer small pots, it is best to have a small pot for each person at the elegant meeting, so as to enjoy themselves.

Porcelain firing in Ming and Qing Dynasties reached its peak, which was reflected in tea ware’s style. Most of tea ware are exquisite, but the style is according to the emperor’s preference. Yong Zhengdi in Qing Dynasty likes elegance, while tea sets in Yongzheng Dynasty are mostly simple in shape, fresh and elegant in style, giving people a pleasing feeling. For example, in Yongzheng period, there were two Yixing Kiln Zisha tea pots, one of which was hexagonal, with the word "before the rain" engraved on the lid, while the other was round and round, with the word "Zhulan" engraved on the lid.

Objects in Yongzheng period

However, Emperor Qianlong advocated magnificence, so the style of tea set in Qianlong Dynasty was warm and gorgeous, and glaze and other techniques were widely used, with bright colors and diverse patterns, with the intention of highlighting the weather of a prosperous generation. For example, in the Qianlong Dynasty, a sapphire Sanqing tea poem covered the bowl. The sapphire was transparent, covered with gold patterns, and the bowl was exquisitely carved with poems. But this is also generally speaking, there were gorgeous tea sets in Yongzheng Dynasty, and there were also elegant tea sets in Qianlong Dynasty.

Qianlong period artifacts

It is worth mentioning that the rulers of the Qing Dynasty kept their own tea culture-milk tea when they accepted the tea culture of the Han nationality. According to records, Manchu people still kept the habit of drinking milk tea after entering the customs, and the palace also set up a special institution to provide milk tea. The Qing emperor liked to have a cup of milk tea before eating, and the milk tea and other drinks in the court were also distributed according to the quantity. The rulers of the Qing dynasty loved milk tea, and even when they went hunting, they didn’t forget to have a drink.

Ranz Ning’s Hongli Hunting Dinner in Qing Dynasty (partial)

Wen Shijun said

The origin of tea culture in China is very early, and ancient ancestors have already recognized the medicinal function of tea. With the development of history, tea has increasingly entered people’s daily lives, and the fragrance of tea can be smelled in the deep gardens of the palace, in the streets of the streets and in the barren hills and wild forests. The rise of tea culture has led to the change of the material form of tea drinking, and also enriched the spiritual life of the ancient people, and tea tasting has been given a different spiritual sustenance by the ancient people. Therefore, China’s tea culture includes both material and spiritual aspects.

reference data

Qiu Jiping: Chinese Tea Painting, Zhejiang Photography Publishing House, 2014.

Liao Baoxiu: Tea Affairs and tea ware in Past Dynasties, Palace Museum Press, 2017.

Zhao Qiuli and Fan Feng: The Archaeological Team of Shandong University Discovered the World’s Earliest Tea Remains, Guangming Daily, November 26, 2021.

(Author: Haoran literature and history Jingsu)

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