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Crew members of a bullet train which is to operate on the Xi'an-Chengdu High-Speed Railway, pose for pictures in front of the bullet train in Chengdu, capital of southwest China's Sichuan Province, Dec. 4, 2017. High-speed trains linking Xi'an, capital of Shaanxi Province, and Chengdu of Sichuan, will begin operation on Dec. 6. (Xinhua/Xue Yubin)
