A passenger registers her information at a receiving point at the New China International Exhibition Center in Beijing, capital of China, March 14, 2020. Beijing has converted the New China International Exhibition Center into a transit center for international inbound passengers. The center, divided into different zones according to the destinations of passengers, is used for people showing no fever, cough and other symptoms in the health quarantine at the airport. (Xinhua/Chen Zhonghao)

Photo shows vehicles used to transfer passengers at the New China International Exhibition Center in Beijing, capital of China, March 14, 2020. Beijing has converted the New China International Exhibition Center into a transit center for international inbound passengers. The center, divided into different zones according to the destinations of passengers, is used for people showing no fever, cough and other symptoms in the health quarantine at the airport. (Xinhua/Chen Zhonghao)

Staff members inquire information of a passenger at the New China International Exhibition Center in Beijing, capital of China, March 14, 2020. Beijing has converted the New China International Exhibition Center into a transit center for international inbound passengers. The center, divided into different zones according to the destinations of passengers, is used for people showing no fever, cough and other symptoms in the health quarantine at the airport. (Xinhua/Chen Zhonghao)

A staff member writes colleague's name on protective suit at the New China International Exhibition Center in Beijing, capital of China, March 14, 2020. Beijing has converted the New China International Exhibition Center into a transit center for international inbound passengers. The center, divided into different zones according to the destinations of passengers, is used for people showing no fever, cough and other symptoms in the health quarantine at the airport. (Xinhua/Chen Zhonghao)

Two Russian passengers are seen at the New China International Exhibition Center in Beijing, capital of China, March 14, 2020. Beijing has converted the New China International Exhibition Center into a transit center for international inbound passengers. The center, divided into different zones according to the destinations of passengers, is used for people showing no fever, cough and other symptoms in the health quarantine at the airport. (Xinhua/Chen Zhonghao)

An inbound passenger, whose destination is south China's Guangdong Province, registers his information at the New China International Exhibition Center in Beijing, capital of China, March 14, 2020. Beijing has converted the New China International Exhibition Center into a transit center for international inbound passengers. The center, divided into different zones according to the destinations of passengers, is used for people showing no fever, cough and other symptoms in the health quarantine at the airport. (Xinhua/Chen Zhonghao)

Staff members wait to transfer passengers, whose destination is north China's Hebei Province, at the New China International Exhibition Center in Beijing, capital of China, March 14, 2020. Beijing has converted the New China International Exhibition Center into a transit center for international inbound passengers. The center, divided into different zones according to the destinations of passengers, is used for people showing no fever, cough and other symptoms in the health quarantine at the airport. (Xinhua/Chen Zhonghao)

Staff members wait to transfer passengers, whose destination is north China's Hebei Province, at the New China International Exhibition Center in Beijing, capital of China, March 14, 2020. Beijing has converted the New China International Exhibition Center into a transit center for international inbound passengers. The center, divided into different zones according to the destinations of passengers, is used for people showing no fever, cough and other symptoms in the health quarantine at the airport. (Xinhua/Chen Zhonghao)

Photo shows a view at the New China International Exhibition Center in Beijing, capital of China, March 14, 2020. Beijing has converted the New China International Exhibition Center into a transit center for international inbound passengers. The center, divided into different zones according to the destinations of passengers, is used for people showing no fever, cough and other symptoms in the health quarantine at the airport. (Xinhua/Chen Zhonghao)

Passengers rest at a waiting area at the New China International Exhibition Center in Beijing, capital of China, March 14, 2020. Beijing has converted the New China International Exhibition Center into a transit center for international inbound passengers. The center, divided into different zones according to the destinations of passengers, is used for people showing no fever, cough and other symptoms in the health quarantine at the airport. (Xinhua/Chen Zhonghao)

A staff member in protective suit guides passengers, whose destination is north China's Hebei Province, to the transfer vehicle at the New China International Exhibition Center in Beijing, capital of China, March 14, 2020. Beijing has converted the New China International Exhibition Center into a transit center for international inbound passengers. The center, divided into different zones according to the destinations of passengers, is used for people showing no fever, cough and other symptoms in the health quarantine at the airport. (Xinhua/Chen Zhonghao)

Staff members inquire information of passengers at the New China International Exhibition Center in Beijing, capital of China, March 14, 2020. Beijing has converted the New China International Exhibition Center into a transit center for international inbound passengers. The center, divided into different zones according to the destinations of passengers, is used for people showing no fever, cough and other symptoms in the health quarantine at the airport. (Xinhua/Chen Zhonghao)

Staff members inquire information of passengers at the New China International Exhibition Center in Beijing, capital of China, March 14, 2020. Beijing has converted the New China International Exhibition Center into a transit center for international inbound passengers. The center, divided into different zones according to the destinations of passengers, is used for people showing no fever, cough and other symptoms in the health quarantine at the airport. (Xinhua/Chen Zhonghao)

Photo shows a view at the New China International Exhibition Center in Beijing, capital of China, March 14, 2020. Beijing has converted the New China International Exhibition Center into a transit center for international inbound passengers. The center, divided into different zones according to the destinations of passengers, is used for people showing no fever, cough and other symptoms in the health quarantine at the airport. (Xinhua/Chen Zhonghao)

Photo shows a view at the New China International Exhibition Center in Beijing, capital of China, March 14, 2020. Beijing has converted the New China International Exhibition Center into a transit center for international inbound passengers. The center, divided into different zones according to the destinations of passengers, is used for people showing no fever, cough and other symptoms in the health quarantine at the airport. (Xinhua/Chen Zhonghao)

Photo shows a waiting area at the New China International Exhibition Center in Beijing, capital of China, March 14, 2020. Beijing has converted the New China International Exhibition Center into a transit center for international inbound passengers. The center, divided into different zones according to the destinations of passengers, is used for people showing no fever, cough and other symptoms in the health quarantine at the airport. (Xinhua/Chen Zhonghao)

Photo shows a view of the New China International Exhibition Center in Beijing, capital of China, March 14, 2020. Beijing has converted the New China International Exhibition Center into a transit center for international inbound passengers. The center, divided into different zones according to the destinations of passengers, is used for people showing no fever, cough and other symptoms in the health quarantine at the airport. (Xinhua/Chen Zhonghao)

Foreign language service is provided for passengers at the New China International Exhibition Center in Beijing, capital of China, March 14, 2020. Beijing has converted the New China International Exhibition Center into a transit center for international inbound passengers. The center, divided into different zones according to the destinations of passengers, is used for people showing no fever, cough and other symptoms in the health quarantine at the airport. (Xinhua/Chen Zhonghao)