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A herd of sheep walk along the frozen Puma Yumco Lake during their annual migration in southwest China's Tibet Autonomous Region, Feb. 9 , 2017. (Xinhua/Purbu Zhaxi)
A herd of sheep walk along the frozen Puma Yumco Lake during their annual migration in southwest China's Tibet Autonomous Region, Feb. 9 , 2017. (Xinhua/Purbu Zhaxi)