less是little的比较级，基本意思是“较少的，更少的”,指物体的体积或分量相对于别的物体少；fewer是few的比较级，用在可数名词前，指数目，表示较少的，而less一般指数量、程度或体积等，意思是较少的或较小的。

less的用法例句：

1.These files have been zipped up to take up less disk space.

这些文档已经进行了压缩，以节省磁盘空间。

2.He is lined up for no less than four US television interviews.

多达4家美国电视媒体排期邀请他上节目接受采访。

3.Other amenities, less commonly available, include a library and exercise room.

还有一些不太常有的设施，包括图书馆和健身房。

4.His team-mates opened hotel windows, shouting "Jump!" and somewhat lessprintable banter.

他的队友打开了酒店的窗户，大叫着“跳!”，还开了一些上不了台面的玩笑。

5.They wanted me to change the title to something less gratuitously offensive.

他们希望我将题目修改一下，以免显得太过冒犯。

fewer例句

1、There are no fewer than 100 different species in the area.

这个地区有不少于100个的不同物种。

2、Fewer people write with their left hand than with their right.

用左手写字的人比用右手的人少。

3、Fewer people desire to live in the north of the country.

想住在这个国家北方的人就更少了。

4、There seem to be fewer tourists around this year.

今年来访的旅游者似乎少了。

5、Contrary to popular belief, women cause fewer road accidents than men.

与普遍的看法相反，妇女交通肇事比男人少。