
Aerial photo taken on April 17, 2017 shows the construction site of Guanting Reservoir Bridge of Beijing-Zhangjiakou high-speed railway in north China. (Xinhua/Xing Guangli)
Aerial photo taken on April 17, 2017 shows the construction site of Guanting Reservoir Bridge of Beijing-Zhangjiakou high-speed railway in north China. (Xinhua/Xing Guangli)