have no idea

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

我不清楚我犯了什么。

Betty had no idea what male chauvinism was.

蒂不知道大男子主义是怎么回事。

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

不在纺工厂工作的人大多不理解什麽是落纱。