Warnings of an enemy attack forced the troops onto the defensive.

敌军显示出进攻的迹象，部队不得不进入戒备状态。

《牛津词典》

Hear no ill of a Friend, nor speak any of an Enemy.

不要听朋友的坏话，也不要说敌人的坏话。

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The third figure is that of an enemy in hot pursuit while the divine Defender still stands by, and he is not left alone.

在第三幅图画里，我们看见一个仇敌紧紧地追逐着他，同时仍有护卫的神站在他的身旁，所以他并不孤独。

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So he was seen as an enemy of conservation.

VOA: special.2010.09.02

We throw our city open to the world and never exclude foreigners from any opportunity of learning and observing even though the eyes of an enemy may profit from our liberality " Pericles boasts once again.

我们的城邦向世界敞开大门,且从不排除让外国人,向我们学习及观摩的机会,就算敌人可能因此,从我们的慷慨中受益“，伯里克利斯再次自夸。

耶鲁公开课 - 政治哲学导论课程节选

God saw that he had to limit the life span of humans, or risk creating an enemy that was nearly equal to him.

上帝发现他限制了人类的寿命，否则就是冒险创造了与他平等的死敌。

耶鲁公开课 - 旧约导论课程节选

In describing the philosophy behind SEAL Team Six thinking, Pfarrer discusses how important it is to predict the actions of an enemy.

FORBES: Learning From SEAL Team Six

But the idea of an "enemy of the public" can be traced all the way back to the year 68AD, when the Roman Senate declared Emperor Nero a "hostis publicus".

BBC: Why do people keep lists of enemies?

Demonstrated by Olsson's colleague Hakan Bystrom, it seems more like playing a video game with a cool piece of kit than a weapon capable of blasting an enemy jet out of the sky.

CNN: Hard sell: Marketing missiles not for faint-hearted