A worker carries vegetables at the Qingda Agricultural Products Wholesale Market in Suihua City, northeast China's Heilongjiang Province, Jan. 20, 2021. Beilin District in Suihua City has carried out strict restrictive measures following a COVID-19 outbreak in the city. In order to ensure the supply of fruits and vegetables in the whole city, Suihua Qingda Agricultural Products Wholesale Market has formulated a strict management process with the daily stocking volume reaching about 350 tonnes. (Photo by Zhang Tao/Xinhua)

A worker carries fruits at the Qingda Agricultural Products Wholesale Market in Suihua City, northeast China's Heilongjiang Province, Jan. 20, 2021. Beilin District in Suihua City has carried out strict restrictive measures following a COVID-19 outbreak in the city. In order to ensure the supply of fruits and vegetables in the whole city, Suihua Qingda Agricultural Products Wholesale Market has formulated a strict management process with the daily stocking volume reaching about 350 tonnes. (Photo by Zhang Tao/Xinhua)

A worker carries vegetables at the Qingda Agricultural Products Wholesale Market in Suihua City, northeast China's Heilongjiang Province, Jan. 20, 2021. Beilin District in Suihua City has carried out strict restrictive measures following a COVID-19 outbreak in the city. In order to ensure the supply of fruits and vegetables in the whole city, Suihua Qingda Agricultural Products Wholesale Market has formulated a strict management process with the daily stocking volume reaching about 350 tonnes. (Photo by Zhang Tao/Xinhua)

A worker carries vegetables at the Qingda Agricultural Products Wholesale Market in Suihua City, northeast China's Heilongjiang Province, Jan. 20, 2021. Beilin District in Suihua City has carried out strict restrictive measures following a COVID-19 outbreak in the city. In order to ensure the supply of fruits and vegetables in the whole city, Suihua Qingda Agricultural Products Wholesale Market has formulated a strict management process with the daily stocking volume reaching about 350 tonnes. (Photo by Zhang Tao/Xinhua)

A worker carries vegetables at the Qingda Agricultural Products Wholesale Market in Suihua City, northeast China's Heilongjiang Province, Jan. 20, 2021. Beilin District in Suihua City has carried out strict restrictive measures following a COVID-19 outbreak in the city. In order to ensure the supply of fruits and vegetables in the whole city, Suihua Qingda Agricultural Products Wholesale Market has formulated a strict management process with the daily stocking volume reaching about 350 tonnes. (Photo by Zhang Tao/Xinhua)