Photo taken on Dec. 17, 2017 shows the construction site of Zhengpantai tunnel of an extension line of the Beijing-Zhangjiakou high-speed railway in north China's Hebei Province. The 52-km extension of the Beijing-Zhangjiakou railway to Hebei's Chongli District, where most of the 2022 Olympic skiing events will be held, is expected to be completed by the end of 2019. (Xinhua/Yang Shiyao)
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