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Wild swans are seen at a wetland in Pinglu, north China's Shanxi Province, Oct. 31, 2018. Migratory wild swans recently came to the wetland to spend the winter. (Xinhua/Zhan Yan)
Wild swans are seen at a wetland in Pinglu, north China's Shanxi Province, Oct. 31, 2018. Migratory wild swans recently came to the wetland to spend the winter. (Xinhua/Zhan Yan)