Aerial photo taken on July 21, 2020 shows a dock submerged by floodwater along the Lanzhou section of the Yellow River in Chengguan District of Lanzhou, northwest China's Gansu Province. The Lanzhou hydrological station of the Yellow River saw the second flood of the river this year with the water flow of 3,000 cubic meters per second, which occured at 8:42 p.m. on Monday. (Xinhua/Fan Peishen)
