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 the years, Levitus says they've managed to compile literally millions of data points from all around the world - and from friend and erstwhile foe alike.

莱维·图斯表示，多年来，从世界各地，无论是昔日的朋友还是敌人，他们已成功地收集了的数百万个点的数据。

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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

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

CENTERFORSECURITYPOLICY: Telling friend from foe

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