So why not take a trip on the oldest underground system today?

所以今天为什么不乘坐世界上最古老的地铁观光一番呢？

youdao

Having the ground, take a look at the underground.

说完地上，在看看地下。

youdao

Having the ground, take a look at the underground.

说完地上，在看看地下。

youdao