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A worker measures the track deviation on a railway at night in Nanning, capital of south China's Guangxi Zhuang Autonomous Region, Jan. 31, 2018. (Xinhua/Zhou Hua)
A worker measures the track deviation on a railway at night in Nanning, capital of south China's Guangxi Zhuang Autonomous Region, Jan. 31, 2018. (Xinhua/Zhou Hua)