Be very careful with this stuff, it can be dangerous if it isn't handled properly.

对这东西要小心，处理得不好可能会发生危险。

《柯林斯英汉双解大词典》

I hope you've been very careful, Mole?

我希望你一直很小心，鼹鼠莫尔？

youdao

Students were very careful when they opened bags of garbage.

学生们打开垃圾袋时非常小心。

youdao

Kahn was very careful to make sure they all received natural light and a view of the ocean.

VOA: special.2009.12.13

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

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

The unnamed individual cautions Chilowitz in that e-mail to "be very careful, " the U.S. attorney says.

FORBES: Magazine Article

Secondly, international cricket is going to have to be very careful it doesn't lose its integrity.

BBC: Justin Langer column

"I think we have got to be very careful about anything like this, " he said.

BBC: Norfolk PCC Stephen Bett: 'Scrap some speed limits'