Aerial photo taken on July 7, 2018 shows the construction site of a bridge in the Gansu-Ningxia section of the Yinchuan-Xi'an high-speed railway in northwest China. The 618-kilometer high-speed railway is scheduled to start operation by the end of 2020, and will reduce travel time between Yinchuan in Ningxia Hui Autonomous Region and Xi'an in Shaanxi Province to about three hours. (Xinhua/Wang Peng)