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Swans fly over the Mao'er Lake in Xuyi County, east China's Jiangsu Province, Dec. 3, 2017. An increasing number of migratory birds rest here on their way to the south during winter time. (Xinhua/Zhou Haijun)
Swans fly over the Mao'er Lake in Xuyi County, east China's Jiangsu Province, Dec. 3, 2017. An increasing number of migratory birds rest here on their way to the south during winter time. (Xinhua/Zhou Haijun)