You have to be careful what you say on TV.

在电视上说话时你不得不谨慎。

《柯林斯英汉双解大词典》

Be careful what you say—he's easily provoked.

说话要小心，他这个人一惹就火儿。

《牛津词典》

Be careful what you wish for. You might get it!

留意你所期盼的。你可能会得到它！

《柯林斯英汉双解大词典》

"First of all, I want everybody here to be careful about what you post on Facebook because in the YouTube age, whatever you do, it will be pulled up again later somewhere in your life.

VOA: special.2009.09.14

I love chemistry now. Be very careful what you say. Have any of you made that statement about hating a subject?

我现在很喜欢化学,所以你们说话的时候,可要小心咯？

麻省理工公开课 - 化学原理课程节选

The message I'm trying to get to here, because I'm running you right up against time, is I have to be careful about what's a primitive step.

我想说的事情是，因为我正在跟大家讲算法时间复杂度，我们需要注意一个基本步骤的定义,如果我可以假设。

麻省理工公开课 - 计算机科学及编程导论课程节选

You tend to become what you think, so for goodness sake be careful what you think.

FORBES: Why Businesses Fail.

Be careful what you request from the other side as that adversary will assuredly request the same from you.

FORBES: Written by Robert D. Brownstone

Be careful what you keep on it and if you lose it, immediately start thinking about your risk exposure.

FORBES: Is Your Mobile App Safe?