I'm damn sure she had no idea.

我敢肯定她不知道。

《牛津词典》

I've no idea how her mind works!

我真不知道她是怎么想的！

《牛津词典》

"I have no idea," she responded.

“我不知道，”她回应道。

《柯林斯英汉双解大词典》

Most of the people who wrote the books had no idea at all where the Canadian Yukon Territory was.

VOA: special.2009.02.04

Or whether or not they had no idea what they were doing, and they've given themselves over to this process.

还是说诗人并不完全理解自己写的文字，而是在创作过程中完全超然忘我。

普林斯顿公开课 - 人性课程节选

I mean, they have no idea how hard we work, and look at this gigantic split infinitive, to dramatically help.

他们不知道我们有多么努力地工作，注意到这之间的巨大鸿沟，会有很大的帮助。

麻省理工公开课 - 固态化学导论课程节选

He said he had no idea who was spreading the false rumours and damaging his business.

BBC: Social media slurs damage Planet Spice takings

It seemed to work, but Sanders had no idea whether the arrangement was normal or bizarre.

NPR: Excerpt: 'When Everything Changed'

Plant manager Will Lejean(ph) says he has no idea when things will be up and running.

NPR: Hurricanes Deal Sugar Industry a Serious Blow