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Herds of cattle walk across a wetland near Mount Chomolhari in Yadong County of Xigaze City, southwest China's Tibet Autonomous Region, June 20, 2019. (Xinhua/Li Xin)

Herds of cattle walk across a wetland near Mount Chomolhari in Yadong County of Xigaze City, southwest China's Tibet Autonomous Region, June 20, 2019. (Xinhua/Li Xin)