If you do this many people will be disappointed in you.

你这样下去很多人都会对你失望的。

Connie: I hope you won't be disappointed in As pen, Maria.

康妮：我希望你在奥斯本不会感到失望，玛丽亚。

A lot of the New Agers are gonna be disappointed in 2012.

许多新时代的人将会在2012年感到失忘了。

I hope so. I just don't want him to be disappointed in me.

但愿如此。我只是不希望他对我失望。

My parents will be disappointed in me if I fail in the exam.

如果我考试不及格，我父母将为我感到失望。