less than + amount
less than 后接具体数量，表示“少于、不到”。
The film lasts less than two hours.
这部电影不到两个小时。
较少量；更少量
较少的数量或量。；较少；较小
较少的数量或量。
A smaller amount or quantity.
I asked for less, but the waiter brought me more.
我要求少一些，但服务员却给我更多。
用法提示：此处 less 作名词，表示“较少的量”，作 ask for 的宾语。
She has less than her brother, so she sometimes borrows his supplies.
她拥有的比她哥哥少，所以她有时借用他的用品。
用法提示：此处 less 作名词，表示“较少的东西”，作 has 的宾语。
We should try to use less of the paper to reduce waste.
我们应该尽量少用一些这种纸以减少浪费。
用法提示：此处 less 作名词，后接 of 短语，表示“较少的部分”。
less than 后接具体数量，表示“少于、不到”。
The film lasts less than two hours.
这部电影不到两个小时。
less of a + 单数名词 表示程度较低，意为“没那么……”。
The new rules are less of a problem than we expected.
新规定没有我们预想的那么麻烦。
much、far 等可放在 less 前加强程度，表示“少得多”。
There is much less to worry about now.
现在要操心的事少多了。
少得多
Much less is known about the ocean floor than about the Moon.
人们对海底的了解比对月球的了解少得多。
更少
Even less is known about his early years.
关于他早年的情况，人们知道的更少。
越来越少
Less and less is being spent on public libraries.
花在公共图书馆上的钱越来越少。
少于；不到
The whole trip took less than an hour.
整个行程用了不到一个小时。
不少于；多达
The repairs cost no less than ten thousand dollars.
维修费用多达一万美元。
少即是多
When you design a page, remember that less is more.
设计页面时要记住，少即是多。
Choose the next layer that will help you use less with more confidence.
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Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.