He really must be careful about thinking aloud. Who knew what he might say?

他真地得对自言自语小心点。谁知道他可能会说什么？

《柯林斯英汉双解大词典》

In summary, historians must be careful about the kind of conflict they emphasize in eighteenth-century America.

总之，历史学家必须谨慎对待他们所强调的18世纪美国的冲突类型。

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In addition, you must be careful about inflation.

此外，你必须考虑通货膨胀的影响。

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But in demanding al-Assad's ouster, Blair said, world powers must be careful about what comes next.

CNN: Syrian rebels, regime forces clash in Aleppo

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

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Morgan needs to build one, and must be more careful about overextending itself.

ECONOMIST: Investment banking