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 say. Girls remember everything.

小心你说的话，女孩可是什么都记得的哦。

youdao

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

In the meantime, your employer is watching, so be careful what you say.

FORBES: Magazine Article

This reinforces the reality that online, as well as in the real world, you need to be careful what you say and who you trust.

FORBES: Age of Context Draft Introduction

My dad would tell me: 'Be careful what you say.

CNN: An American soccer star playing for Palestine