A medical worker writes encouraging words on a colleague's protective suit at a community COVID-19 testing site in Yuhua District of Shijiazhuang, capital of north China's Hebei Province, Jan. 7, 2021. Shijiazhuang started to conduct citywide nucleic acid tests covering all residents on Wednesday. The city has set up 5,011 sites to collect swab samples for the tests. (Xinhua/Yang Shiyao)
