Don't raise your hopes too high, or you may be disappointed.

不要希望过高，否则你可能会失望的。

《牛津词典》

I'll do what I can, but don't get your hopes up.

我会尽力而为的，但别抱太大希望。

《牛津词典》

For the iPad 2, don't get your hopes up too high.

对iPad 2，别把希望抬得太高。

youdao

"On Tuesday,after a year of debate and a century of trying, after so many of you shared your stories and your heartaches and your hopes, that promise was finally fulfilled.

VOA: standard.2010.03.25

I think it takes your breath away to think of the unspeakably high hopes that John Milton had for his career.

我觉得像弥尔顿这样说出自己对职业如此高的希望,是很让人吃惊的。

耶鲁公开课 - 弥尔顿课程节选

Tell us your resolutions and hopes for two thousand ten, and what you will be doing New Year's Eve.

VOA: special.2009.12.28

They make a nice couple, but don't get your hopes up for a "Thin Man"-like series.

CNN: Review: 'Gone Baby Gone' is good, very good

Dear compatriots, during this debate you have also expressed your worries and your hopes.

BBC: French President Jacques Chirac

Talk in generalities about your hopes, dreams and passions, as long as those things are not controversial.

CNN: Online dating and a formula for love