underground (n)

东京的地铁系统以高效和准时著称。

The ___underground in Tokyo are known for their efficiency and punctuality.

我们可以坐地铁去市中心。

We can take the ___underground to the city centre.

伦敦地铁是世界上历史最悠久的地铁系统之一。

The London ___Underground is one of the oldest subway systems in the world.

地铁站就在博物馆的对面。

The ___underground station is opposite the museum.