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Workers prepare for laying the long steel rail for Lhasa-Nyingchi railway in Gonggar County of Shannan, southwest China's Tibet Autonomous Region, March 8, 2019. (Xinhua/Li Xin)

Workers prepare for laying the long steel rail for Lhasa-Nyingchi railway in Gonggar County of Shannan, southwest China's Tibet Autonomous Region, March 8, 2019. (Xinhua/Li Xin)