请教这句话中的lest是什么用法：Lest I act I will perish.

请教这句话中的lest是什么用法：Lest I act I will perish. lest得用法? lest的用法? 英语过去完成时用法i ( work )_____ in here for five years since i lest I just need someone who never lest me down I wrote down the date of his birthday lest I should forget i I turned down the radio lest it should interfere with his le I'll write down your name and address lest you ___as a witne I fear lest their surrender million people stop帮我翻译 338.Lest anyone _____ it strange,let me assure you that it i Me wins the support of the inverse i will perish The enemy will not perish of itself.中的“of ”是什么...