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Combination photo shows maintenance workers inspecting subway trains that have returned to a depot in Nanning, capital of south China's Guangxi Zhuang Autonomous Region, on the early hours of Jan. 1, 2020. (Xinhua/Cao Yiming)
Combination photo shows maintenance workers inspecting subway trains that have returned to a depot in Nanning, capital of south China's Guangxi Zhuang Autonomous Region, on the early hours of Jan. 1, 2020. (Xinhua/Cao Yiming)