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A bullet train runs on the Yangxian section of Xi'an-Chengdu high-speed railway line in northwest China's Shaanxi Province, March 21, 2018. (Xinhua/Tang Zhenjiang)
A bullet train runs on the Yangxian section of Xi'an-Chengdu high-speed railway line in northwest China's Shaanxi Province, March 21, 2018. (Xinhua/Tang Zhenjiang)