We must be careful to avoid making mistakes in the exam.

我们必须仔细点，以免在考试中犯错。

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Whatever we do, we must be careful.

无论我们做什么，必须要细心。

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We must be careful, however, to avoid misconception.

然而我们必须仔细，以免造成错误想法。

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Even though we have a noun, the smile, that if you're not careful might lull you into thinking there must be a thing, the smile.

即使我们有笑容这个名词,如果你不够谨慎,可能会想当然地认为,一定存在着笑容这一事物

耶鲁公开课 - 死亡课程节选

As socially conscious individuals, we must be careful about our hiring practices.

FORBES: What If Barack Obama And Paul Krugman Ran A Business?

Although many in Congress are seeking a detailed plan today, we must be careful not to act in haste, foregoing better approaches.

WHITEHOUSE: Jacob J. Lew Testimony to House Science Committee, 08/06/1998 | The White House

But, we must be careful when using the slippery slope argument that it doesn't become a disguised form of "moral relativism" or irrationalism.

CENTERFORSECURITYPOLICY: Center For Security Policy