When a mother hen makes a loud noise or crouches down, all her chicks understand this as a warning of danger.

当一只母鸡大声作响或是蜷缩蹲下，小鸡们知道这是有危险的警告。

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Fear can be a guiding friend if you learn how to swallow it, and listen to it only when it serves its true purpose of warning you when you are in danger.

恐惧的真正意义，是可以在你身处危险时给予你警告。如果你能够好好地控制它，并在需要的时候跟从它，那它将成为一位良师益友。

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At present, they can shoot only if their life or that of others is in danger, after firing a warning shot.

目前，警察只有在自身和他人生命受到威胁的情况下，先鸣枪示警，然后才可以向犯罪分子开火。

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It was simply safer, from the point of view of survival, to hear rustling in the grass as a warning of danger.

WSJ: May 21 and the Enduring Appeal of the Apocalypse

Hampshire Fire and Rescue Service chief officer John Bonney, current President of the Chief Fire Officers Association, attended the scene and issued a warning about the danger of timber framed buildings.

BBC: Firefighters tackle Basingstoke construction site fire

Michael Mullen, has made several recent statements warning of the danger a nuclear-armed Iran will pose to global security - and by extension, to US national security.

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