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 ![]() Passengers pose for photos while experiencing the trial operation of the first subway line in Southwest China's mountainous metropolis of Chongqing, July 28, 2011. [Photo/CFP]  | 
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 ![]() Passengers walk inside a subway station during the trial operation of the first subway line in Southwest China's mountainous metropolis of Chongqing, July 28, 2011. [Photo/Xinhua]  | 
