It pays to know the enemy — not least because at some time you may have the opportunity to turn him into a friend.

了解敌人对我们还是有好处的- - - - - - -特别是那种有可能在某一天成为你的朋友的人。

youdao

The better we know the enemy, the better we target human and financial resources, and shape the research agenda for the future.

我们越了解敌人，就越有能力更好的锁定人力和财政资源，并为未来制定研究议程。

youdao

As the Chinese saying goes, "know the enemy and know yourself, and you can fight a hundred battles with no danger of defeat", one should know both himself and his counterpart to win each battle.

中国有一名话：“知己知彼，百战不殆。”意思说，打仗的时候，既要了解自己，还要了解自己的对手，这样才能在每场战役中取胜。

youdao

"We know that her husband's political enemy, Mister D'Arcy,stole the letter.

VOA: special.2009.12.26

Socrates seems to dissolve those bonds of familiarity, loyalty and attachment : that we all have by saying to Polemarchus, "How do we know, how do we really know "? the distinction between friend and enemy?"

苏格拉底似乎要解开,那些我们都习以为常的常规，忠诚与情感附属的束缚,所以才向，Polemarchus，提问，“我们如何得知，我们如何真正得知,朋友与敌人间的区别“

耶鲁公开课 - 政治哲学导论课程节选

They know the enemy has options, and they want to deny the enemy those options as much as possible.

NPR: Is the Iraq Surge Strategy Working?

Our armed forces - like their counterparts in the intelligence community, Department of Homeland Security and law enforcement - have a professional duty to know the enemy and develop appropriate responses to the threat doctrine.

CENTERFORSECURITYPOLICY: The real reason they hate us

This was the essential difficulty of the task at hand: The higher-ups in the U.S. Army needed to know about the enemy in this unexplored province, so in order to learn as much as they could, they were going to stick a small group of troops in its midst.

CNN: Excerpt: 'The Outpost: An Untold Story of American Valor'