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A maintenance worker inspects the driver's compartment of a subway train to prepare it for operation in Nanning, capital of south China's Guangxi Zhuang Autonomous Region, on the early hours of Jan. 1, 2020. (Xinhua/Cui Bowen)

A maintenance worker inspects the driver's compartment of a subway train to prepare it for operation in Nanning, capital of south China's Guangxi Zhuang Autonomous Region, on the early hours of Jan. 1, 2020. (Xinhua/Cui Bowen)