Swans fly over Sanmenxia Swan Lake Wetland Park in Sanmenxia City, central China's Henan Province, Jan. 14, 2017. Migratory swans came from the Siberia region to winter in the Sanmenxia Yellow River wetland. (Xinhua/Li Bo)
Swans fly over Sanmenxia Swan Lake Wetland Park in Sanmenxia City, central China's Henan Province, Jan. 14, 2017. Migratory swans came from the Siberia region to winter in the Sanmenxia Yellow River wetland. (Xinhua/Li Bo)
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