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A maintenance worker inspects the bottom of a subway train carriage 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/Cao Yiming)
A maintenance worker inspects the bottom of a subway train carriage 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/Cao Yiming)