People participate in a swimming contest in Xin'anjiang River, Jiande City, east China's Zhejiang Province, July 28, 2018. 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)