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A villager harvests herbage for cattle at an artificial grassland in Beicun Village of Nyima County, southwest China's Tibet Autonomous Region, Sept. 18, 2017. (Xinhua/Zhang Rufeng)

A villager harvests herbage for cattle at an artificial grassland in Beicun Village of Nyima County, southwest China's Tibet Autonomous Region, Sept. 18, 2017. (Xinhua/Zhang Rufeng)