名词
中文翻译：地下交通
同义词：
['subway traffic', 'underground transportation']
例句：
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1. The underground traffic is usually very busy during rush hours.
在高峰时段，地铁交通通常非常繁忙。
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2. The subway system is the main mode of underground traffic in this city.
地铁系统是这座城市主要的地下交通方式。
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3.The underground traffic is essential for people who need to travel long distances.
对于需要长途旅行的人来说，地铁交通是必不可少的。