An aerial photo taken on July 25, 2015 shows the Weishui Wetland of Fotang Sewage Treatment Plant in Yiwu, east China's Zhejiang Province. (Photo: Xinhua/Lyu Bin)
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An aerial photo taken on July 25, 2015 shows the Weishui Wetland of Fotang Sewage Treatment Plant in Yiwu, east China's Zhejiang Province. (Photo: Xinhua/Lyu Bin)