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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Nothing suspicious was discerned, but still it was necessary for them to be on their guard.

他们并没有发现什么可疑的东西，但是小心戒备还是必要的。

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Print Robin van Persie has warned Arsenal must be on their guard in Europe this season against all calibre of opposition after a scare in their first group match against Standard Liege.

范佩西警告说，阿森纳必须在本赛季警惕他们在欧冠赛场上碰到任何对手，他们在小组赛第一场比赛与标准列日比赛上被吓了一跳。

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

BBC: Flu rate 'at record low'

That means drivers will have to be on their guard more than ever, especially when driving in freezing conditions.

BBC: Snow and ice warning for parts of Scotland

Horse owners in Oxfordshire are being warned to be on their guard following a rise in thefts of equipment.

BBC: Horse tack theft rise in Oxfordshire prompts warning