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Staff members work at the construction site of the Xiahuayuan section of the Beijing-Zhangjiakou railway in north China's Hebei Province, May 7, 2019. (Xinhua/Xing Guangli)
Staff members work at the construction site of the Xiahuayuan section of the Beijing-Zhangjiakou railway in north China's Hebei Province, May 7, 2019. (Xinhua/Xing Guangli)