其实也没多大的区别 平时可以互换
be careful of=be careful about 小心 对什么谨慎 注意 表示注意自己健康等的方面 注意做到什么
be careful with=be careful in 嘱咐别人小心做事 是要注意别让某东西毁坏 或者让某物或某事伤害到自己
再讲讲be careful of 吧， be careful of强调对...认真，细心，小心（比较褒义）
例句：You are very careful of your work.你对你的工作很谨慎/认真
Be careful (not) to do... 小心地做某事 希望我的回答对你有帮助，忘采纳~
be careful with，about，of后面都跟sth
I was careful with Tom because he lied
I was careful about the bike because it had been broken
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