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Photo taken on the early hours of Jan. 1, 2020 shows subway trains awaiting maintenance at a depot in Nanning, capital of south China's Guangxi Zhuang Autonomous Region. (Xinhua/Cao Yiming)

Photo taken on the early hours of Jan. 1, 2020 shows subway trains awaiting maintenance at a depot in Nanning, capital of south China's Guangxi Zhuang Autonomous Region. (Xinhua/Cao Yiming)