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1·We're new in East Asia, so we have to be careful in choosing the location for our regional office.

我们刚刚来到东亚，所以必须小心谨慎地选择区域办事处的地点。

2·Be careful in all things.

凡事要小心。《新英汉大辞典》

3·The fellow is as sharp as a razor. Be careful in your dealings with him.

这家伙厉害得很， 你和他打交道时要特别小心。《新英汉大辞典》

4·Be careful in money matters.

在钱方面要特别小心。

5·You should be careful in the sun.

在阳光下要当心。

6·You should be careful in the sun.

在阳光下你要当心。

7·Be careful in doing this.

在钱方面要特别小心。

8·But be careful in the u.

但在美国，请小心。

9·Be careful in meetings.

会议时要谨慎。

10·Be careful in dealing with such people.

与这种人打交道要小心谨慎。