Staff members perform sanitation operations at the platform of the east railway station in Chengdu, southwest China's Sichuan Province, Feb. 2, 2021. (Xinhua/Liu Kun)
A staff member of the Chengdu center for disease control under the China Railway Chengdu Bureau Group Co., Ltd. collects environmental samples for COVID-19 test on an automatic ticketing machine of the east railway station in Chengdu, southwest China's Sichuan Province, Feb. 2, 2021. (Xinhua/Liu Kun)
Staff members of the Chengdu center for disease control under the China Railway Chengdu Bureau Group Co., Ltd. collect environmental samples for COVID-19 test at an escalator of the east railway station in Chengdu, southwest China's Sichuan Province, Feb. 2, 2021. (Xinhua/Liu Kun)
A staff member of the Chengdu center for disease control under the China Railway Chengdu Bureau Group Co., Ltd. collects environmental samples for COVID-19 test at the waiting hall of the east railway station in Chengdu, southwest China's Sichuan Province, Feb. 2, 2021. (Xinhua/Liu Kun)
Staff members of the Chengdu center for disease control under the China Railway Chengdu Bureau Group Co., Ltd. are about to perform sanitation operations on passenger trains at a railway station in Chengdu, southwest China's Sichuan Province, Feb. 2, 2021. (Xinhua/Liu Kun)
Staff members of the Chengdu center for disease control under the China Railway Chengdu Bureau Group Co., Ltd. perform sanitation operations on a passenger train at a railway station in Chengdu, southwest China's Sichuan Province, Feb. 2, 2021. (Xinhua/Liu Kun)
Staff members of the Chengdu center for disease control under the China Railway Chengdu Bureau Group Co., Ltd. collect environmental samples for COVID-19 test at an entrance to the east railway station in Chengdu, southwest China's Sichuan Province, Feb. 2, 2021. (Xinhua/Liu Kun)
Staff members of the Chengdu center for disease control under the China Railway Chengdu Bureau Group Co., Ltd. collect environmental samples for COVID-19 test at an entrance to the east railway station in Chengdu, southwest China's Sichuan Province, Feb. 2, 2021. (Xinhua/Liu Kun)
Staff members of the Chengdu center for disease control under the China Railway Chengdu Bureau Group Co., Ltd. confirm sanitation information with a technician (1st L) at a railway station in Chengdu, southwest China's Sichuan Province, Feb. 2, 2021. (Xinhua/Liu Kun)
