on cloud nine 高兴得飘飘然，极其快乐，高兴到九霄云外

　　Jenny was on cloud nine for days after Mike asked her to the prom.

　　迈克邀请詹妮参加学校舞会，她兴奋了好几天。

　　When Lucy was born I was on cloud nine.

　　Lucy出生的时候，我都乐得找不着北了。

　　疯狂练习吧！