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1·I always travel by underground.

我总是乘地铁。《牛津词典》

2·Now I can come to school by underground instead of by bus.

现在我可以乘地铁来学校而不是乘公共汽车。

3·There was something wrong with my car, so I went to work by underground.

我的车出毛病了，所以我乘地铁上班。

4·Babies go by underground.

小朋友乘地铁出发。

5·If you want to avoid traffic jam, you can travel by underground.

如果你想避开交通拥堵的话，你可以乘地铁出行。

6·It is very convenient to travel in London by underground.

在伦敦游玩时，坐地铁是很方便的。

7·It spreads primarily by underground stems; colonies form when pieces of the root system or whole plants float into an area and take root or when seeds float into a suitable area and germinate.

它主要通过地下茎传播；当根系统碎片或整个植物漂浮到一个区域并生根，或当种子漂浮到一个合适的区域并发芽时，菌落就形成了。

8·They can go by underground .

他可以坐地铁去。

9·Why not go by Underground?

为什么不坐地铁去呢？

10·My mom goes to work by underground.

我妈妈乘地铁去工作。