A resident receives nucleic acid test at a testing site in Heihe, northeast China's Heilongjiang Province, Oct. 31, 2021. As of 12:00 p.m. Saturday, Heihe in Northeast China's Heilongjiang Province reported 54 locally transmitted confirmed COVID-19 cases, according to local health authorities. Authorities in Heihe have started massive nucleic acid testing to contain the spread of infections, and taken measures to ensure the supply of daily necessities for residents. (Xinhua/Wang Song)