The Athenians were invaded by an army from the outside, and Codros led his forces out against them.

雅典人遭到外敌入侵,寇德罗斯率军迎敌

耶鲁公开课 - 古希腊历史简介课程节选

In Genesis 3:15, God says to the snake: "I will put enmity Between you and the woman, ; And between your offspring and hers; They shall strike at your head, And you shall strike at their heel."

创世纪》第三章第十五节，耶和华对蛇说：,我要叫你和女人,彼此为敌，你的后裔与女人的后裔也彼此为敌;,她们要伤你的头，你将伤她们的脚跟“

耶鲁公开课 - 旧约导论课程节选

This is not to say that the Dutch don't fight the English, too, because they do.

这并不是说荷兰人不与英国人为敌,因为他们确实开战过

耶鲁公开课 - 欧洲文明课程节选

The reason for that complexity is because your immune system needs to be able to respond to all the potential foreign invaders that we could encounter.

整个系统之所以如此复杂是因为,免疫系统需要应对所有,我们要面对的来犯之敌

耶鲁公开课 - 生物医学工程探索课程节选

Socrates' disillusion of that very framework,challenges, it seems to me, the very possibility of political life by questioning the question or the distinction between friend and enemy.

苏格拉底,对这个框架的醒悟，在我看来，挑战了政治生活的可能性,就在他提问,或区别友与敌的问题时。

耶鲁公开课 - 政治哲学导论课程节选

To know who its friends and enemies are?

辨别谁是友？谁是敌？

耶鲁公开课 - 政治哲学导论课程节选