I am on cloud nine.什么意思？为什么？

Question

如题所述

Answer 1

I am on cloud nine.
我太高兴了。
I'm on cloud nine.
我太高兴了。
I was on cloud nine after I learned that I had just passed the examination.
获悉我考试及格的消息，我喜出望外。

Answer 2

我大约九岁了

Answer 3

我特别高兴、我心情好极了。

有点像中文的九霄云外，吼。本回答被提问者采纳