subway

underground, subway, tube

这些名词均可表示“地铁”之意。
underground: 一般用词，指城市中的地铁，主要用于英国。
subway: 指城市中的地铁或通道，主要用于美国。
tube: 主要用于英国口语中。

名词 subway:

1. an electric railway operating below the surface of the ground (usually in a city)
   同义词：metro, tube, underground, subway system
2. an underground tunnel or passage enabling pedestrians to cross a road or railway
   同义词：underpass

1. The gang jumped an old woman in the subway.
   一伙歹徒在地下人行道突然袭击一老妇人。
2. An ordinary subway train, approaching the station, can be twice as loud as the loudest jet.
   平常的地下火车接近车站时，发出的声音可能是最大声的喷射机的两倍。
3. Last Sunday, a News pressman named Gerald Boyd got worked over with baseball bats on his way to the subway and no one except us gave it much attention.
   上星期日，纽约每日新闻一个名字叫波伊德的印刷工人在去地铁途中被人用球棒痛殴。除我们以外没人注意。
4. She saw us on the subway.
   在地铁站她见到我们了
5. Use the subway to cross the road.
   请走地下通道穿越马路。
6. I want to get there by subway.
   我想乘地铁去那儿。