书籍是最安静且最恒久的朋友。
"Books are the quietest and most constant of friends."
释义：用兵的方法，以攻破敌人心理防线为上策，攻破城池为下策。
The concept of computational efficiency is central to the design of learning algorithms.
The difference between a policy and a crusade is that a policy is judged by its results, while a crusade is judged by how good it makes its crusaders feel.
如果你和你的竞争对手做的事情本质上是一样的，你可能不会太成功。