【彩神APP争8的网址走势图_彩神APP争8的网址走势图官网】Railway workers examine falling rocks to ensure security in Chongqing, SW China

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Railway workers take selfie after work 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)

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