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Children play on a train in southwest China's Tibet Autonomous Region, Nov. 29, 2017. Tibetans from Qinghai and Gansu provinces took train home after their journey of pilgrimage or travelling. (Xinhua/Chogo)

Children play on a train in southwest China's Tibet Autonomous Region, Nov. 29, 2017. Tibetans from Qinghai and Gansu provinces took train home after their journey of pilgrimage or travelling. (Xinhua/Chogo)