have no idea

Betty had no idea what male chauvinism was.

贝蒂不知道大义怎么回事。

I have no idea who this murderous fiend may be.

我不知道这个杀人不眨眼的恶魔谁。

I had no idea of the gaffe which I was committing.

我不楚我犯了什么错误。

People who don't work in a spinnery mostly have no idea about doffing.

不在纺织工厂工作的人大多不理解什纱。