If people knew that other motives might compromise the accuracy of their beliefs, most would probably try to be on their guard.

如果人们意识到其他的动机有可能会损害他们信念的准确性，那大部分人都会试图保持警惕。

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The words set them on their guard.

这话引起了他们的警惕。

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They did their best to keep on their guard.

他们尽量保持警惕。

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But she warned members of the public to be on their guard against the virus.

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He was found out in time, and this and other incidents put the Ecuador FA on their guard.

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Previous generations of Americans knew that they were naive about money and so were properly on their guard.

FORBES: Magazine Article