名词
中文翻译：地铁
同义词：
['subway', 'subway system']
例句：
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1. The MTA is responsible for the maintenance of the subway system.
地铁公司负责维护地铁系统。
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2. I usually take the MTA to get to work every day.
我通常乘坐地铁去上班。
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3. The MTA has announced plans to extend the subway line into new areas.
地铁公司宣布计划将地铁线路延伸至新区域。