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Birds are seen at a wetland in Sanmenxia, central China's Henan Province, Dec. 12, 2017. Every year, the migratory swans come from Siberia to spend the winter here. (Xinhua/Gu Lilin)
Birds are seen at a wetland in Sanmenxia, central China's Henan Province, Dec. 12, 2017. Every year, the migratory swans come from Siberia to spend the winter here. (Xinhua/Gu Lilin)