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(dāng)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(yù)防回來(lái)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(lái)免得他看見(jiàn)。
4. We talked in a low voice lest we should wake the baby up.
   我們小聲說(shuō)話以免吵醒嬰兒。
5. I got up early lest I (should) miss the train.
   我早起以免錯(cuò)過(guò)了火車(chē)。
6. They spoke in whispers lest they should be heard.
   他們低聲說(shuō)話，唯恐被別人聽(tīng)見(jiàn)。

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