一无所知

He closed up when he found he knew practically nothing about the subject under discussion.

当发现自己对所讨论的题实际上一无所知时, 就不再开口了。

This might seem very perplexing to those who know nothing about it.

这对那些对它一无所知的人来说可能显得很难理解。

He may be rich for aught I know.

也许有钱但我一无所知。

I regret my ignorance on the subject.

我很遗, 对此题一无所知。

He displayed a willful ignorance of their plight.

对于们的困境故意装作一无所知。

We are still woefully ignorant of the causes of this disease.

不幸的是，我们仍对这种疾病的致病原因一无所知。

I hasten to add that I knew nothing of the fraud at the time.

我忙不迭地补充说，我当时对那个骗局一无所知。

He was a little vague when I asked what had happened.

我了什么事时，一无所知。

As I opened up the computer to try and fix the problem, I realized that I was getting into completely uncharted waters and considered whether to leave it to the experts.

当我打开电脑打算修理它时，我意识到这是一个自己一无所知的领域，于是我考虑要不要请专业人员帮我解决。