Definition
- Singular
A railway system where electric trains travel through tunnels beneath the ground.
地下铁
I take the underground to work every day.
我每天都坐地铁上班。
The underground network in London is very extensive.
伦敦的地铁网络非常广泛。
Taking the underground is a better option due to the traffic jam.
由于交通堵塞，坐地铁是更好的选择。