Swans fly over the wetland of Yanghe Reservoir in Zhangjiakou City, north China's Hebei Province, March 7, 2017. (Xinhua/Yang Shiyao)
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Swans fly over the wetland of Yanghe Reservoir in Zhangjiakou City, north China's Hebei Province, March 7, 2017. (Xinhua/Yang Shiyao)