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Do you know how many metro lines does Shanghai have? The answer is eighteen in total, including Line 1 to Line 17(fifteen lines except that Line 14 and Line 15 are in construction), Pujiang Line, Maglev Line and Jinshan Line. People benefit from the convenience of how metro can send you everywhere while still get confused by the complexity of the metro system sometimes. As a foreigner, or tourist who come to the city for first time, how to find your way to the destination without getting lost by public transportation?