A boy plays in a train on Subway Line 4 in Nanjing, capital of east China's Jiangsu Province, Jan. 18, 2017. The 33.8-kilometer subway line started trial operation on Wednesday. (Xinhua/Wang Xin)
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A boy plays in a train on Subway Line 4 in Nanjing, capital of east China's Jiangsu Province, Jan. 18, 2017. The 33.8-kilometer subway line started trial operation on Wednesday. (Xinhua/Wang Xin)
