A community staff registers information of residents who have just returned Beijing at Fuxiang community in Dongcheng District in Beijing, capital of China, on Feb. 12, 2020. Work and production has resumed gradually in enterprises, communities and malls, etc. in Beijing since Feb. 10 with comprehensive measures taken to prevent and control the epidemic caused by the novel coronavirus. (Xinhua/Ju Huanzong)

A staff member disinfects the environment at a street in Sanlitun business area in Beijing, capital of China, on Feb. 12, 2020. Work and production has resumed gradually in enterprises, communities and malls, etc. in Beijing since Feb. 10 with comprehensive measures taken to prevent and control the epidemic caused by the novel coronavirus. (Xinhua/Ju Huanzong)

A vendor wearing face mask serves a customer in a vegetable market at Fuxiang community in Dongcheng District in Beijing, capital of China, on Feb. 12, 2020. Work and production has resumed gradually in enterprises, communities and malls, etc. in Beijing since Feb. 10 with comprehensive measures taken to prevent and control the epidemic caused by the novel coronavirus. (Xinhua/Ju Huanzong)

People line up to take body temperature checks at Sanlitun business area in Beijing, capital of China, on Feb. 12, 2020. Work and production has resumed gradually in enterprises, communities and malls, etc. in Beijing since Feb. 10 with comprehensive measures taken to prevent and control the epidemic caused by the novel coronavirus. (Xinhua/Ju Huanzong)

Workers disinfect the handrails inside the "Joy City" shopping mall in Chaoyang District in Beijing, capital of China, on Feb. 12, 2020. Work and production has resumed gradually in enterprises, communities and malls, etc. in Beijing since Feb. 10 with comprehensive measures taken to prevent and control the epidemic caused by the novel coronavirus. (Xinhua/Ju Huanzong)

A placard, demonstrating the prevention measures the package delivery company has taken, is seen on the electric tricycle of a deliveryman in Chaoyang District in Beijing, capital of China, on Feb. 12, 2020. Work and production has resumed gradually in enterprises, communities and malls, etc. in Beijing since Feb. 10 with comprehensive measures taken to prevent and control the epidemic caused by the novel coronavirus. (Xinhua/Ju Huanzong)

Photo taken on Feb. 12, 2020 shows a view of the South Luogu Lane, a popular tourist spot, in Beijing, capital of China. Work and production has resumed gradually in enterprises, communities and malls, etc. in Beijing since Feb. 10 with comprehensive measures taken to prevent and control the epidemic caused by the novel coronavirus. (Xinhua/Ju Huanzong)

Photo taken on Feb. 12, 2020 shows a view of Shilipu Subway Station during morning rush hour in Beijing, capital of China. Work and production has resumed gradually in enterprises, communities and malls, etc. in Beijing since Feb. 10 with comprehensive measures taken to prevent and control the epidemic caused by the novel coronavirus. (Xinhua/Ju Huanzong)

People wearing face masks are seen in a subway carriage on Line Six during morning rush hour in Beijing, capital of China, on Feb. 12, 2020. Work and production has resumed gradually in enterprises, communities and malls, etc. in Beijing since Feb. 10 with comprehensive measures taken to prevent and control the epidemic caused by the novel coronavirus. (Xinhua/Ju Huanzong)

Photo taken on Feb. 12, 2020 shows a view of the South Luogu Lane, a popular tourist spot, in Beijing, capital of China. Work and production has resumed gradually in enterprises, communities and malls, etc. in Beijing since Feb. 10 with comprehensive measures taken to prevent and control the epidemic caused by the novel coronavirus. (Xinhua/Ju Huanzong)

A worker disinfects the assembly line in a workshop of an automotive company in Beijing, capital of China, on Feb. 12, 2020. Work and production has resumed gradually in enterprises, communities and malls, etc. in Beijing since Feb. 10 with comprehensive measures taken to prevent and control the epidemic caused by the novel coronavirus. (Photo by Peng Ziyang/Xinhua)

Workers wearing face masks work in a workshop of an automotive company in Beijing, capital of China, on Feb. 12, 2020. Work and production has resumed gradually in enterprises, communities and malls, etc. in Beijing since Feb. 10 with comprehensive measures taken to prevent and control the epidemic caused by the novel coronavirus. (Photo by Peng Ziyang/Xinhua)

A infrared fever screening system used for checking people's body temperature is seen in the China World Trade Center Tower 3 in Beijing, capital of China, on Feb. 12, 2020. Work and production has resumed gradually in enterprises, communities and malls, etc. in Beijing since Feb. 10 with comprehensive measures taken to prevent and control the epidemic caused by the novel coronavirus.

A placard showing support to Wuhan is seen on a building in the Xidan business area in Beijing, capital of China, on Feb. 12, 2020. Work and production has resumed gradually in enterprises, communities and malls, etc. in Beijing since Feb. 10 with comprehensive measures taken to prevent and control the epidemic caused by the novel coronavirus. (Xinhua/Zhang Chenlin)

(Xinhua/Zhang Chenlin)

A placard, introducing prevention and control measures of the novel coronavirus, is seen on the window of an office in the China World Trade Center Tower 3 in Beijing, capital of China, on Feb. 12, 2020. Work and production has resumed gradually in enterprises, communities and malls, etc. in Beijing since Feb. 10 with comprehensive measures taken to prevent and control the epidemic caused by the novel coronavirus. (Xinhua/Zhang Chenlin)

Photo taken on Feb. 12, 2020 shows a street with light traffic in the Xidan business area in Beijing, capital of China, on Feb. 12, 2020. Work and production has resumed gradually in enterprises, communities and malls, etc. in Beijing since Feb. 10 with comprehensive measures taken to prevent and control the epidemic caused by the novel coronavirus. (Xinhua/Zhang Chenlin)

A placard, notifying that the Nano anti-bacterial coating technology is used for panel of the lift, is seen in front of an elevator in the China World Trade Center Tower 3 in Beijing, capital of China, on Feb. 12, 2020. Work and production has resumed gradually in enterprises, communities and malls, etc. in Beijing since Feb. 10 with comprehensive measures taken to prevent and control the epidemic caused by the novel coronavirus. (Xinhua/Zhang Chenlin)