The ability to recognize faces is not just handy for cocktail parties, it's crucial for distinguishing friend from foe and facilitating social interactions.

识别面孔的能力不仅仅方便于鸡尾酒会，也是区分朋友与敌人以及促进社交互动的关键。

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Over the past nine years, the Marines have made increasing use of biometrics to distinguish friend from foe in Iraq and Afghanistan.

在过去的九年时间里，海军陆战队不断的将生物特征识别应用在伊拉克和阿富汗地区以辨识敌友。

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That is true even today. Fire is the grassland's friend and the forest's foe.

甚至在今天那也是正确的——大火是草地的朋友，森林的敌人。

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Over time, the babies' immune systems start to distinguish between friend and foe in the microbial world, and launch attacks on potentially harmful bugs while leaving beneficial ones, like those that live in the gut, alone.

CNN: Connection between dirty diapers, childhood health

Still, this is a story that cannot be told without Breton because such was his dominating personality that, with the exception of Duchamp, Picasso and the aging Matisse, all the poets, writers and artists of the day were forced to define themselves as his friend or foe (and many of course went from friend to foe).

ECONOMIST: 20th-century art

One of the most difficult things in life is to draw the line between friend and foe.

CENTERFORSECURITYPOLICY: Telling friend from foe