not have a clue/have no clue
毫无头绪、毫不理解、一无所知
- "Who invented algebra?" "I don't have a clue."
“代数是谁发明的？”“我压根儿不知道。” - Don't ask your father which key to press - he hasn't got a clue about computers.
别问你父亲该按哪个键——他对计算机一窍不通。
not have the faintest idea
根本不知道
- "Is she going to stay?" "I haven't the faintest idea."
“她要留下来吗？我一点儿也不知道。” - I don't have the faintest idea what you're talking about!
我根本不知道你在说什么！
not have the foggiest (idea)
完全不明白、一无所知、茫无头绪
- I didn't have the foggiest idea what he was talking about.
我完全不明白他在讲什么。
can't for the life of me remember
绞尽脑汁还是想不起
- I can't for the life of me remember her name.
我绞尽脑汁还是想不起她的名字。
be out of touch
不了解最新情况
- I didn't see any news all the time I was on holiday, so I'm completely out of touch.
我在度假期间一直都没有看新闻，所以现在对外界一无所知。
doesn't ring any bells
听起来并不耳熟
- No, I'm sorry, that description doesn't ring any bells with me.
不！很遗憾，那个说法我听起来并不耳熟。
