Residents wearing face masks are seen in Hong Kong, south China, Dec. 23, 2020. (Xinhua/Lui Siu Wai)
Residents walk on the street in Hong Kong, south China, Dec. 21, 2020. (Xinhua/Lui Siu Wai)
Residents wearing face masks are seen in Hong Kong, south China, Dec. 21, 2020. (Xinhua/Lui Siu Wai)
A woman arranges seafood in a shop in Hong Kong, south China, Dec. 23, 2020. (Xinhua/Lui Siu Wai)
Residents wearing face masks take a subway in Hong Kong, south China, Dec. 23, 2020. (Xinhua/Lui Siu Wai)
People exercise in a park in Hong Kong, south China, Dec. 23, 2020. (Xinhua/Lui Siu Wai)
A woman walks in a park in Hong Kong, south China, Dec. 23, 2020. (Xinhua/Lui Siu Wai)
Residents wearing face masks are seen in Hong Kong, south China, Dec. 23, 2020. (Xinhua/Lui Siu Wai)
People take photos in a park in Hong Kong, south China, Sept. 11, 2020. (Xinhua/Wu Xiaochu)