Photo taken on Aug. 13, 2019 shows a wide slot of slotted gravity dam in Xin'anjiang River Hydropower Station in Jiande City, east China's Zhejiang Province. Built in 1950s, Xin'anjiang River Hydropower Station is China's first large-scale hydropower station designed and constructed by the country independently. With rapid economic growth in China, the hydropower station that once played important role in power supply of east China has been shifting its function from power generation to flood control and water supply. (Xinhua/Weng Xinyang)