A police officer directs traffic in the snow Friday in Mohe, Northeast China’s Heilongjiang province.

A worker works on a production line Thursday in Qingdao, East China’s Shandong province.

Medical workers test nucleic acid samples collected from local residents in a laboratory in Lishui, East China’s Zhejiang province.

A worker disinfects a door Monday at a metro station in Shijiazhuang, North China’s Hebei province.

Delivery workers sort parcels Sunday in Beijing.