Boats sail on the Dian Lake in Kunming, southwest China's Yunnan Province, Sept. 30, 2017. The water quality of Dian Lake has been improved a lot after years of water ecosystem restoration and wastewater management. (Xinhua/Lin Yiguang)
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Boats sail on the Dian Lake in Kunming, southwest China's Yunnan Province, Sept. 30, 2017. The water quality of Dian Lake has been improved a lot after years of water ecosystem restoration and wastewater management. (Xinhua/Lin Yiguang)
