Staff members work outside 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. The nucleic acid test laboratory named Lieying, meaning Falcon, is running around the clock to shorten the waiting time of passengers at the railway station, testing up to 6,000 samples a day. (Xinhua/Ji Chunpeng)
