Staff members work in a plant at a company making mechanical and electronic products at the Qinhuangdao Economic and Technological Development Zone in Qinhuangdao, north China's Hebei Province, March 2, 2020. As of Monday, the zone has witnessed about 6,800 workers go back work and 927 companies resume production while strict measures being taken to prevent and control the epidemic. (Xinhua/Yang Shiyao)