这正是我想要知道的

That's what I want to find out
　　　
-- We have got a new dog, would you like to come around and play with him?
-- Well, I don't know. Does he bite?
-- That's what I want to find out.

-- 我们又得到了一只新狗，你要过来和他玩玩吗？
-- 哦， 我不知道。他咬人吗？
-- 这正是我想要知道的。