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A railway worker checks the cliff surface in Qianjiang District of Chongqing, southwest China, Feb. 7, 2018. Railway workers here examine falling rocks every day to ensure the security of running trains. (Xinhua/Yang Min)
A railway worker checks the cliff surface in Qianjiang District of Chongqing, southwest China, Feb. 7, 2018. Railway workers here examine falling rocks every day to ensure the security of running trains. (Xinhua/Yang Min)