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A swan flies over Swan Lake in Rongcheng national swan nature reserve in Rongcheng City, east China's Shandong Province, Dec. 10, 2017. (Xinhua/Liu Xianguo)
A swan flies over Swan Lake in Rongcheng national swan nature reserve in Rongcheng City, east China's Shandong Province, Dec. 10, 2017. (Xinhua/Liu Xianguo)