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Passengers board the train on Line 5 of the metro system in north China's Tianjin, Oct. 22, 2018. Line 5 of Tianjin metro system began its trail operation on Monday. (Xinhua/Yue Yuewei)
Passengers board the train on Line 5 of the metro system in north China's Tianjin, Oct. 22, 2018. Line 5 of Tianjin metro system began its trail operation on Monday. (Xinhua/Yue Yuewei)