They know nothing about cooking.

他们对烹饪一窍不通。

I know nothing about programming.

我对编程一窍不通。

I know nothing about this language.

我对这门语言一窍不通。

I know nothing at all about his plan.

我对他的计划一无所知。

I know nothing at all about the content of this book.

我对这本书的内容一无所知。

They know nothing at all about the details of the new policy.

他们对新政策的细节一无所知。

It's won't hurt anybody, but they may think you know nothing about their food culture.

这不会伤害任何人，但他们可能认为你对他们的饮食文化一无所知。

They that know nothing fear nothing.

无知者无畏。 初生牛犊不怕虎。

I know nothing about rap.

我对说唱一无所知。

I know nothing beyound it.

除此以外，我啥也不知道。