Photo taken on March 29, 2017 shows Majiaba Bridge of Xi'an-Chengdu high-speed railway in Jiangyou, southwest China's Sichuan Province. The Xi'an-Chengdu line is China's first rail route to run through the Qinling Mountains, which are the natural boundary between north and south China. It will begin operation on Dec. 6. [Photo/Xinhua]