[译] 你在会上要说些什么，须加注意。
[误] Be careful of what you will say at the meeting。

[正] Be careful what you will say at the meeting。
[注] "be careful of +名词"表示"注意……"，但当be careful后跟从句时，介词of必须省略。再如：Be careful of your health.小心你的身体。