less是little的比較級，基本意思是“較少的，更少的”,指物體的體積或分量相對于別的物體少；fewer是few的比較級，用在可數名詞前，指數目，表示較少的，而less一般指數量、程度或體積等，意思是較少的或較小的。

less的用法例句：

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

這些文檔已經進行了壓縮，以節省磁盤空間。

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

多達4家美國電視媒體排期邀請他上節目接受采訪。

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

還有一些不太常有的設施，包括圖書館和健身房。

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

他的隊友打開了酒店的窗戶，大叫著“跳!”，還開了一些上不了臺面的玩笑。

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

他們希望我將題目修改一下，以免顯得太過冒犯。

fewer例句

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

這個地區有不少于100個的不同物種。

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

用左手寫字的人比用右手的人少。

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

想住在這個國家北方的人就更少了。

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

今年來訪的旅游者似乎少了。

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

與普遍的看法相反，婦女交通肇事比男人少。