地下铁道

例句：

1. 1. The subway is the best way to get around in this city.
   地铁是这个城市最好的交通方式。
2. 2. She took a subway to work every day.
   她每天乘坐地铁去上班。
3. 3. The subway station was packed with people waiting for the next train.
   地铁站挤满了等待下一班火车的人们。