The advantage of having only two wheels is that the car can be shrunk into a small package.

仅用双轮的优点是汽车能够缩水成小包装。

youdao

With two wheels in the front and two full seats it almost looks like a racecar, but it only has one rear wheel.

该车前端配置两轮，配备两个座位，外形酷似赛车，但其尾端只有一个后轮。

youdao

The fact that it is the only futuristic green car that runs on two wheels earns this a direct spot on the list, if nothing else does.

事实上这款汽车能榜上有名是因为它是未来环保汽车中唯一的双轮汽车。

youdao

And in a motorcycle, you only have two wheels.

开摩托车时，你只有两个轮子。

I'm afraid of 实战 - SpeakingMax英语口语达人

One failed in July 2012, leaving it with only two functioning wheels at this time, Sobeck said.

CNN: Planet-hunting Kepler spacecraft in trouble