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A policeman introduces anti-theft knowledge to passengers on train 1485 from north China's Taiyuan to southwest China's Chengdu, Feb. 5, 2018. (Xinhua/Cao Yang)
A policeman introduces anti-theft knowledge to passengers on train 1485 from north China's Taiyuan to southwest China's Chengdu, Feb. 5, 2018. (Xinhua/Cao Yang)