The most serious deficiency in NATO's air defence is the lack of an identification system to distinguish friend from foe.

北约防空的最大缺陷就是缺乏能够辨认敌友的识别系统。

《柯林斯英汉双解大词典》

Humans, like many animals, use body language to distinguish friend from foe.

像很多动物一样，人类使用肢体语言来区分朋友和敌人。

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It holds our instincts and our training and allows us to distinguish friend from foe, love from hate.

大脑里有我们的本能和训练，让我们区分敌友和爱恨。

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As political loyalties and alliances shift, a small people like the Jews must be willing to distinguish friend from foe.

CENTERFORSECURITYPOLICY: Telling friend from foe

The Internet is, in any case, set up in a way that makes it difficult for computers to distinguish friend from foe.

ECONOMIST: Forensic computing studies the anatomy of computer crime

Leeks became the national emblem, according to legend, after St David advised the Britons on the eve of a successful battle against the Saxons to wear leeks in their caps to easily distinguish friend from foe.

BBC: Council makes St David's Day gaffe