A passenger pays for the ticket of subway line 3 by cellphone in Qingdao, east China's Shandong Province, Dec. 18, 2016. Qingdao's subway line 3, the first subway line in Shandong Province, was officially opened on Sunday. (Xinhua/Zhang Jin'gang)
A passenger pays for the ticket of subway line 3 by cellphone in Qingdao, east China's Shandong Province, Dec. 18, 2016. Qingdao's subway line 3, the first subway line in Shandong Province, was officially opened on Sunday. (Xinhua/Zhang Jin'gang)
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