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People visit Guangzhou Metro Museum in Guangzhou, capital of south China's Guangdong Province, Dec. 20, 2017. Guangzhou Metro Museum celebrated its first anniversary on Wednesday. (Xinhua/Liang Xu)

People visit Guangzhou Metro Museum in Guangzhou, capital of south China's Guangdong Province, Dec. 20, 2017. Guangzhou Metro Museum celebrated its first anniversary on Wednesday. (Xinhua/Liang Xu)