Photo taken on July 18, 2020 shows the flooded Yangtze River in Nanjing, east China's Jiangsu Province. The water resources department of east China's Jiangsu Province raised its flood alert level to the highest of red for the Nanjing section of the Yangtze River at 9 a.m. Saturday after a record-high water level was seen in the section. (Photo by Zhang Meng/Xinhua)

Photo taken on July 18, 2020 shows a water gauge of a hydrological station in Yangtze River in Nanjing, east China's Jiangsu Province. The water resources department of east China's Jiangsu Province raised its flood alert level to the highest of red for the Nanjing section of the Yangtze River at 9 a.m. Saturday after a record-high water level was seen in the section. (Photo by Su Yang/Xinhua)

Photo taken on July 18, 2020 shows the flooded Yangtze River in Nanjing, east China's Jiangsu Province. The water resources department of east China's Jiangsu Province raised its flood alert level to the highest of red for the Nanjing section of the Yangtze River at 9 a.m. Saturday after a record-high water level was seen in the section. (Photo by Su Yang/Xinhua)