Photo taken on May 30, 2019 shows the construction site of the Zhangjiakou Station of the Beijing-Zhangjiakou high-speed railway in Zhangjiakou, north China's Hebei Province. The main structure of the Zhangjiakou Station has been basically completed. (Xinhua/Xing Guangli)

Photo taken on May 30, 2019 shows the construction site of the Zhangjiakou Station of the Beijing-Zhangjiakou high-speed railway in Zhangjiakou, north China's Hebei Province. The main structure of the Zhangjiakou Station has been basically completed. (Xinhua/Xing Guangli)

Photo taken on May 30, 2019 shows the model of the Zhangjiakou Station of the Beijing-Zhangjiakou high-speed railway in Zhangjiakou, north China's Hebei Province. The main structure of the Zhangjiakou Station has been basically completed. (Xinhua/Xing Guangli)

Workers are seen at the construction site of the Zhangjiakou Station of the Beijing-Zhangjiakou high-speed railway in Zhangjiakou, north China's Hebei Province, May 30, 2019. The main structure of the Zhangjiakou Station has been basically completed. (Xinhua/Xing Guangli)

Photo taken on May 30, 2019 shows the construction site of the Zhangjiakou Station of the Beijing-Zhangjiakou high-speed railway in Zhangjiakou, north China's Hebei Province. The main structure of the Zhangjiakou Station has been basically completed. (Xinhua/Xing Guangli)