他不知道警察在监视他。

He was ___unaware that the police were watching him.

我完全不知道这个问题。

I was quite ___unaware of the problem.

尽管你可能在一个学科上是专家，但你可能不知道其他学科的一些基础知识。

Although you may be an expert in one subject, you can be ___unaware of some basics in others.