I don't know

　　不知道

　　hear nothing of; be ignorant of; be insensible of; be unaware of; in the dark ;

　　例句:

　　我不知道它意味着什么。

　　I don't know what it means.

　　他承认他也不知道。

　　He admitted he didn't know.

　　但她却不知道从哪里下手。

　　But she did not know where to begin.

　　你永远不知道会发生什么事。

　　You never know what's coming for you.