小于的英文：
less than

参考例句：

An automobile that is bigger in size than a subcompact but smaller than an intermediate.
小型汽车在尺寸上大于超小型汽车但小于中型汽车的汽车

Nitrogen cylinders less than 65 inches long use a frangible disc device.
长度小于65英寸的氮钢瓶使用易碎盘装置。

7he Karate Kid(1984)
空手道小于(美国影片)

A step-down transformer has a turns ratio less than 1
降压变压器的匝数比小于1。

subatomic physics deals with all entities smaller than the atom
亚原子物理学研究一切小于原子的客体。

fractional horsepower motor
小功率电动机(小于一马力)

The jar's capacity is under three quarts.
这个坛子的容量小于三夸特

An acceptable level should be less than 1.5% for short periods of time and less than 1% for steady state.
可接受不平衡程度,短时应小于1.5%,长时间稳态时应小于1%

The file containing the character translation table has fewer than 512 bytes.
包含字符转换表的文件小于512字节。

It is quite unusual for a freshman to be younger than eighteen or older than nineteen.
一年级新生小于十八岁或大于十九岁是相当特殊的。

less是什么意思：
adj. 较小的,较少的
adv. 较小地，较少地；不如
n. 更少的数（量，额）
prep. 减去；扣除；差...

Men are less arrogant, women less choice.
男人不那么趾高气扬了，女人也不那么挑三拣四了。

As the years went on he opposed her less and less.
随着岁月的流逝，他对她的反抗越来越少。

I could do no less.
这是我起码要做的。

The less you meddle with him the better.
你跟他越少来往越好。

Speak less and listen more
要少说多听

than是什么意思：
conj. 比，比较；与其...（宁愿...）；除了...（之外）；当，就
prep. 超过

It will be better than you think for.
情况将比你预料的好。

This was more than bathroom banter.
这可不仅仅是浴室中开玩笑的话而已。

Faith is stronger than reason.
宗教信仰比推理劝说更具威力.

Better leave than lack
有余胜过不足

Prevention is better than cure
预防胜于治疗