A worker delivers bread at the entrance of an area under special management for COVID-19 in Huanggu District, Shenyang, northeast China's Liaoning Province, Jan. 7, 2021. A strong cold wave swept the city on Thursday. (Xinhua/Yao Jianfeng)

A medical staff member gestures at the entrance of an area under special management for COVID-19 in Huanggu District, Shenyang, northeast China's Liaoning Province, Jan. 7, 2021. A strong cold wave swept the city on Thursday. (Xinhua/Yao Jianfeng)

A firefighter carries a hose after dealing with an emergency in Huanggu District in Shenyang, northeast China's Liaoning Province, Jan. 7, 2021. A strong cold wave swept the city on Thursday. (Xinhua/Yao Jianfeng)

A police officer works at a residential compound of Yuhong District in Shenyang, northeast China's Liaoning Province, Jan. 7, 2021. A strong cold wave swept the city on Thursday. (Xinhua/Yao Jianfeng)

A medical staff member walks out of a residential compound after collecting nucleic acid testing samples in Huanggu District, Shenyang, northeast China's Liaoning Province, Jan. 7, 2021. A strong cold wave swept the city on Thursday. (Xinhua/Yao Jianfeng)

Deliveryman Han Yu unloads a package for residents at a residential compound of Yuhong District in Shenyang, northeast China's Liaoning Province, Jan. 7, 2021. A strong cold wave swept the city on Thursday. (Xinhua/Yao Jianfeng)

A police officer works in Huanggu District in Shenyang, northeast China's Liaoning Province, Jan. 7, 2021. A strong cold wave swept the city on Thursday. (Xinhua/Yao Jianfeng)

Staff member Wang Lan (R) registers supplies for residents at a residential compound of Yuhong District in Shenyang, northeast China's Liaoning Province, Jan. 7, 2021. A strong cold wave swept the city on Thursday. (Xinhua/Yao Jianfeng)

A driver puts on a hat before unloading goods in Huanggu District, Shenyang, northeast China's Liaoning Province, Jan. 7, 2021. A strong cold wave swept the city on Thursday. (Xinhua/Yao Jianfeng)

A worker is seen in an area under special management for COVID-19 in Huanggu District, Shenyang, northeast China's Liaoning Province, Jan. 7, 2021. A strong cold wave swept the city on Thursday. (Xinhua/Yao Jianfeng)