How do you say "I know that I don't know"? How would I translate ""I know that I don't know" into Chinese? 

I can translate the similar sentence "I know that you don't know" as 我知道你不知道. However, saying 我知道我不知道 sounds strange. What's the best way to translate it? Is there a sensible translation that preserves the grammatical structure in English, which has "I don't know" as the nominalized object of "I know"?
我意识到我不知道. I realize that I don't know.

我知道我不了解情况. I know I don't know the situation.