subway

/ˈsəbˌweɪ/

an electric railway operating below the surface of the ground (usually in a city)

中文释义：地铁；地下通道

Taking the subway is the fastest way to get downtown.

乘坐地铁是去市中心最快的方式。

The subway system in Tokyo is extremely efficient and punctual.

东京的地铁系统非常高效且准时。