“exactly sure”可以造什么句，exactly sure造句

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

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

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

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