People wearing face masks are seen in the the Central district of Hong Kong, south China, Jan. 4, 2020. (Xinhua/Wang Shen)
People wearing face masks are seen in the Central district of Hong Kong, south China, Jan. 4, 2020. (Xinhua/Wang Shen)
People pass by a herbal tea shop in the Central district of Hong Kong, south China, Jan. 4, 2020. (Xinhua/Wang Shen)
People wearing face masks are seen in the the Central district of Hong Kong, south China, Jan. 4, 2020. (Xinhua/Wang Shen)