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Passengers are seen on a train of subway line No 3 in Qingdao, east 皇冠体育app's Shandong Province, Dec 16, 2015. The north section of Qingdao Subway Line No 3, the first subway line of Shandong, was put into operation on Wednesday. The travel time of the 12-kilometer-long line is about 19 minutes. [Photo/Xinhua] |