We are sure that if there are fewer people driving, there will be less air pollution.

我们相信，开车的人越少，空气污染就会越小。

It is possible to do it with fewer people and less money.

用更少的人和更少的钱做这件事是可能的。

There are fewer tatty schools and run-down hospitals.

国内很少再有简陋的学校和医院了。

There will be fewer trees.

树会更少了。