Photo taken on Jan. 22, 2021 shows separate units of an observation center in Tonghua, northeast China's Jilin Province. According to local authority, the observation center, consisting of 1,186 separate units, have been finished installation on Wednesday. The center will be used for centralized isolation. (Photos: Xinhua)

Workers unload materials at the construction site of an observation center in Tonghua, northeast China's Jilin Province, Jan. 26, 2021. According to local authority, the observation center, consisting of 1,186 separate units, have been finished installation on Wednesday. The center will be used for centralized isolation.

Photo taken on Jan. 27, 2021 shows paintings on the wall at an observation center in Tonghua, northeast China's Jilin Province. According to local authority, the observation center, consisting of 1,186 separate units, have been finished installation on Wednesday. The center will be used for centralized isolation.