A staff of Shijiazhuang distribution center of Cainiao Network, the logistics platform of e-commerce giant Alibaba, disinfects packages in Shijiazhuang, north China's Hebei Province, Jan. 23, 2021. Logistics companies in Shijiazhuang have strengthened disinfection measures as the COVID-19 prevention and control efforts to make sure the safety of their employees and customers. (Xinhua/Mu Yu)

A staff of Shijiazhuang distribution center of Cainiao Network, the logistics platform of e-commerce giant Alibaba, disinfects packages in Shijiazhuang, north China's Hebei Province, Jan. 23, 2021. Logistics companies in Shijiazhuang have strengthened disinfection measures as the COVID-19 prevention and control efforts to make sure the safety of their employees and customers. (Xinhua/Mu Yu)

Aerial photo taken on Jan. 23, 2021 shows a staff of Shijiazhuang distribution center of Cainiao Network, the logistics platform of e-commerce giant Alibaba, disinfecting packages in Shijiazhuang, north China's Hebei Province. Logistics companies in Shijiazhuang have strengthened disinfection measures as the COVID-19 prevention and control efforts to make sure the safety of their employees and customers. (Xinhua/Mu Yu)

A staff of China Post disinfects packages in Shijiazhuang, north China's Hebei Province, Jan. 23, 2021. Logistics companies in Shijiazhuang have strengthened disinfection measures as the COVID-19 prevention and control efforts to make sure the safety of their employees and customers. (Xinhua/Mu Yu)

A staff of Shijiazhuang distribution center of Cainiao Network, the logistics platform of e-commerce giant Alibaba, disinfects packages in Shijiazhuang, north China's Hebei Province, Jan. 23, 2021. Logistics companies in Shijiazhuang have strengthened disinfection measures as the COVID-19 prevention and control efforts to make sure the safety of their employees and customers. (Xinhua/Mu Yu)