形容詞 l:

1. being ten more than forty
   同義詞：fifty, 50, l

1. Beware your hat, lest it should be blown away.
   當心你的帽子別被吹走。
2. He took a flashlight lest it should get dark before he returned.
   為了預防回來以前天就黑了，所以他帶著手電筒。
3. Hide it lest he (should) see it.
   把它藏起來免得他看見。
4. We talked in a low voice lest we should wake the baby up.
   我們小聲說話以免吵醒嬰兒。
5. I got up early lest I (should) miss the train.
   我早起以免錯過了火車。
6. They spoke in whispers lest they should be heard.
   他們低聲說話，唯恐被別人聽見。

lest

conj.（連接詞）
For fear that:
唯恐，以免：
例句：
tiptoed lest the guard should hear her; anxious lest he become ill.
踮起腳趾走路，以免守衛(wèi)發(fā)現(xiàn)她；唯恐他生病而感到焦慮

來源：
Middle English
中古英語
from Old English tht lôs the [so that not]
源自 古英語 tht lôs the [為了不使]
from lôs [less] * see less
源自 lôs [較少的，更小的] *參見 less