Customers have meals at a shopping mall in Lanzhou, northwest China's Gansu Province, March 18, 2020. Local restaurants have restored dine-in service with strict measures taken to fight against the COVID-19 in recent days. (Xinhua/Du Zheyu)

Customers have meals at a hot pot restaurant in Lanzhou, northwest China's Gansu Province, March 18, 2020. Local restaurants have restored dine-in service with strict measures taken to fight against the COVID-19 in recent days. (Xinhua/Du Zheyu)

Customers have meals at a restaurant in Lanzhou, northwest China's Gansu Province, March 18, 2020. Local restaurants have restored dine-in service with strict measures taken to fight against the COVID-19 in recent days. (Xinhua/Du Zheyu)

A customer registers her information before entering a restaurant in Lanzhou, northwest China's Gansu Province, March 18, 2020. Local restaurants have restored dine-in service with strict measures taken to fight against the COVID-19 in recent days. (Xinhua/Du Zheyu)

Customers have meals at a restaurant in Guiyang, southwest China's Guizhou Province, March 18, 2020. Restaurants in Guiyang have orderly resumed dine-in service on Wednesday. (Xinhua/Ou Dongqu)

Customers have meals at a restaurant in Guiyang, southwest China's Guizhou Province, March 18, 2020. Restaurants in Guiyang have orderly resumed dine-in service on Wednesday. (Xinhua/Ou Dongqu)