Residents take a subway train on the Subway Line 3 in Nanjing, capital of east China's Jiangsu Province, April 1, 2015. The 44.87-kilometer-long Subway Line 3 in Nanjing was put into trial operation on Wednesday, making the total length of the city's subway reach 225 kilometers, the fourth longest in China. (Xinhua/Yan Minhang)
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