Swans are seen at the Swan Lake in Rongcheng national swan nature reserve in Rongcheng City, east China's Shandong Province, Dec. 10, 2017.
(Xinhua/Liu Xianguo)
(Xinhua/Liu Xianguo)
(Xinhua/Liu Xianguo)
(Xinhua/Liu Xianguo)
(Xinhua/Liu Xianguo)
Swans fly over the Swan Lake in Rongcheng national swan nature reserve in Rongcheng City, east China's Shandong Province, Dec. 10, 2017.
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Swans are seen at the Swan Lake in Rongcheng national swan nature reserve in Rongcheng City, east China's Shandong Province, Dec. 10, 2017.
(Xinhua/Liu Xianguo)
(Xinhua/Liu Xianguo)
(Xinhua/Liu Xianguo)
(Xinhua/Liu Xianguo)
Swans fly over the Swan Lake in Rongcheng national swan nature reserve in Rongcheng City, east China's Shandong Province, Dec. 10, 2017.
(Xinhua/Liu Xianguo)
(Xinhua/Liu Xianguo)
(Xinhua/Liu Xianguo)
(Xinhua/Liu Xianguo)
(Xinhua/Liu Xianguo)