giving a lot of attention to what you are doing so that you do not have an accident, make a mistake, or damage something

Be careful with the glasses. 小心玻璃杯。

Be careful where you put that hot pan. 要注意把热锅放在合适的地方。

Be careful to look both ways when you cross the road. 过马路时要注意向两边看。

Michael is a very careful worker. 迈克尔工作起来很细心。

After careful consideration of your proposal, I regret to say that we are unable to accept it. 仔细考虑了你的建议后，我很遗憾地告诉你我们不能接受。

He's in a really foul temper so be careful (about/of) what you say to him. 他心情很糟，所以跟他说话要当心。