名词
中文翻译：地铁
同义词：
['subway', 'subway system', 'urban rail transit']
例句：
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1.The Metro is the fastest way to get around the city.
地铁是快速到达城市的最好方式。
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2. She took the Metro to work every day.
她每天乘坐地铁去上班。
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3.The Metro station was crowded with people waiting for the next train.
地铁站挤满了等待下一班火车的人们。