A staff member cleans and sterilizes the restroom to prevent the spread of COVID-19 at Beijing Daxing International Airport in Beijing, capital of China, Jan. 21, 2021. (Xinhua/Peng Ziyang)

A staff member cleans and sterilizes rental wheelchairs to prevent the spread of COVID-19 at Beijing Daxing International Airport in Beijing, capital of China, Jan. 21, 2021. (Xinhua/Peng Ziyang)

A staff member cleans and sterilizes the public area to prevent the spread of COVID-19 at Beijing Daxing International Airport in Beijing, capital of China, Jan. 21, 2021. (Xinhua/Peng Ziyang)

A passenger has her body temperature checked after showing her health tracking information to prevent the spread of COVID-19 at Beijing Daxing International Airport in Beijing, capital of China, Jan. 21, 2021. (Xinhua/Peng Ziyang)