你要再三小心。
You must be careful of what you say to her.
你跟她说话可得多加小心。
During an interview you need to be careful of what you say.
在面试的时候你要注意你所说的话。
E. g. Be careful of what you say because your words are powerful.
例句：谨慎用词，因为你说的话是很有影响力的。
Be careful of what you say to the people you love, because once you've said it, you can never take it back.
对你爱的人说出的话要小心，因为一旦你说出口了，就永远收不回来了。
Be careful of what you say to the people you love, because once you've said it, you can never take it back.
对你爱的人说出的话要小心，因为一旦你说出口了，就永远收不回来了。幸福，是用来感觉的，而不是用来比较的。
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？
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？
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