Aerial photo shows the construction site of a centralized medical observation center in Shijiazhuang, capital of north China's Hebei Province, Jan. 13, 2021. Construction workers on Wednesday started building a centralized medical observation center in Shijiazhuang, where clustered COVID-19 cases occurred. The isolation center will likely cover 33 hectares of area near a village in Zhengding County, Shijiazhuang. (Xinhua/Yang Shiyao)
