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Groups of bar-headed geese fly over the Lhasa river valley where they spend the winter season, southwest China's Tibet Autonomous Region, Nov. 23, 2017. (Xinhua/Zhang Rufeng)
Groups of bar-headed geese fly over the Lhasa river valley where they spend the winter season, southwest China's Tibet Autonomous Region, Nov. 23, 2017. (Xinhua/Zhang Rufeng)