他真地得对自言自语小心点。谁知道他可能会说什么？

He really must be careful about thinking aloud. Who knew what he might say?

《柯林斯英汉双解大词典》

小心那些可能让你对自己感觉不好或不开心的人。

Be careful of people who may make you feel bad or unhappy about yourself.

youdao

“我会小心的。”小红帽对妈妈说。

"I will take great care," said Little Red-Cap to her mother.

youdao

And you don't have to be too careful or fine about gradations of punishment in the state of nature.

而且在自然状态中，你不必,对实施惩罚的程度太过小心。

耶鲁公开课 - 公正课程节选

So, that kind of stuff is something to look at but I'd be very careful in buying equities.

所以这样的投资工具就是我们所要考虑的,但我对资产板块的投资会比较小心。

耶鲁公开课 - 金融市场课程节选

Where you've got a couple of wishes and you aren't careful about how exactly you state the wish And so you get what you want ? but it ends up being a nightmare,right?

给你几个可以实现的愿望,但是不小心没说对愿望,你得到了自己想要的,却发现那是个噩梦对不对？

耶鲁公开课 - 死亡课程节选