用exactly sure造句子，“exactly sure”造句

I'm not exactly sure what she does there, but it seems to be related to humorous poems.

I've been drinking for-i'm not exactly sure how long.

If you have heard the term "floating population" before and were not exactly sure what that meant, now you know.

So a neutron is challenged if you will because once it's born we're not exactly sure which way it's gonna go.