胖小咪咪
是英文，常指“一旦，曾经”。
1、一次
I've only been there once.
我只去过那里一次。
He cleans his car once a week.
他每周洗一次汽车。
She only sees her parents once every six months.
她每半年才探望一次父母。
2 、曾；曾经
I once met your mother.
我曾经见过你母亲。
He once lived in Zambia.
他曾在赞比亚生活过。
This book was famous once, but nobody reads it today.
这本书曾名噪一时，但现在却无人问津。
3、（用于否定句、疑问句和if后）曾，根本
He never once offered to help.
他从没有主动提出过帮忙。
If she once decides to do something, you won't change her mind.
她一旦决定干什么，谁也改变不了她的主意。
阿雯雯777
once：做副词1.一次，一回。eg：I saw him once and never again. 我见过他一回，以后再也没见到过。 Once a week ,she wrote to her mother. 她一星期一次给她妈妈写信。2：曾经，一度eg：She was oce my best friend. 她曾是我最好的朋友。3：用于条件句、否定句等，一旦eg：If you once forget it,you won't come up with it again.你一旦忘记它，就不会再想起来。4：用于否定句，一次也，完全eg：I haven't seen him here once.我自爱这里一次也没见到过他。 I couldn't once get his meaning.我完全不能理解他的意思。5：乘以1eg：Once eight is eight. 一乘八得八。6：亲属关系上隔一代eg：a cousin once removed 同（外）曾祖的堂（或表）兄弟（姐妹）做名词一次，一回eg：Do it just this once .就做这一次。做连词一旦......就......eg：Once you have taken the examination ,you will be able to relax. 你一旦考过，就可以轻松了。做形容词从前的，一度的eg：the once capital of the nation 那个国家的旧都。答题完毕，希望对你有所帮助。
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