A staff member disinfects a waiting room of Beijing Railway Station in Beijing, capital of China, June 18, 2020. Following the upgrade of emergency response to COVID-19 from Level III to Level II in Beijing, Beijing Railway Station has conducted strict measures to prevent and control the spread of the epidemic. Photo:Xinhua

Staff members disinfect the hall of Beijing Railway Station in Beijing, capital of China, June 18, 2020. Following the upgrade of emergency response to COVID-19 from Level III to Level II in Beijing, Beijing Railway Station has conducted strict measures to prevent and control the spread of the epidemic. Photo:Xinhua

A staff member disinfects a waiting room of Beijing Railway Station in Beijing, capital of China, June 18, 2020. Following the upgrade of emergency response to COVID-19 from Level III to Level II in Beijing, Beijing Railway Station has conducted strict measures to prevent and control the spread of the epidemic. Photo:Xinhua

A passenger walks to an entrance of the subway at Beijing Railway Station in Beijing, capital of China, June 18, 2020. Following the upgrade of emergency response to COVID-19 from Level III to Level II in Beijing, Beijing Railway Station has conducted strict measures to prevent and control the spread of the epidemic.Photo:Xinhua

Passengers are seen at Beijing Railway Station in Beijing, capital of China, June 18, 2020. Following the upgrade of emergency response to COVID-19 from Level III to Level II in Beijing, Beijing Railway Station has conducted strict measures to prevent and control the spread of the epidemic.Photo:Xinhua

Passengers go through the body temperature monitoring area at the hall of Beijing Railway Station in Beijing, capital of China, June 18, 2020. Following the upgrade of emergency response to COVID-19 from Level III to Level II in Beijing, Beijing Railway Station has conducted strict measures to prevent and control the spread of the epidemic.Photo:Xinhua