Staff members change shifts in a cabin next to a temporary laboratory for nucleic acid testing at the square of the Nanjing Railway Station in Nanjing, capital of east China's Jiangsu Province, July 27, 2021.(Photo: Xinhua)
A staff member works in a temporary laboratory for nucleic acid testing at the square of the Nanjing Railway Station in Nanjing, capital of east China's Jiangsu Province, July 27, 2021.(Photo: Xinhua)
Staff members work in a temporary laboratory for nucleic acid testing at the square of the Nanjing Railway Station in Nanjing, capital of east China's Jiangsu Province, July 27, 2021.(Photo: Xinhua)
Photo taken with a drone on July 27, 2021 shows temporary laboratories for nucleic acid testing at Nanjing Youth Olympic Games Sports Park in Nanjing, east China's Jiangsu Province.(Photo: Xinhua)