名词
中文翻译：次级道路
同义词：
['subway', 'subwayline', 'subway station']
例句：
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1. The subway is thefastest way to get around the city.
地铁是城市内最快的交通方式。
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2. The subwaystation is located at the corner of thestreet.
地铁站位于街道的拐角处。
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3. Thesubway is crowded with people going towork every morning.
每天早上，地铁上挤满了去上班的人们。