当一个人说 two wheels are better than four 的时候他的意思就是骑自行车比开汽车好。

例句

If you want to get healthy, get out of your car and onto your bike; two wheels are better than four!

The traffic is really bad in the city so two wheels are definitely better than four.

请注意

所谓 two-for-one 就是汉语里的买一送一，买一个送一个。

I hope you like eating cabbage; I got them on a two-for-one offer at the supermarket, so we've got lots to eat.