程序测试可以用来显示错误的存在，但绝不能显示它们的不存在！

"In mathematics, you don't understand things. You just get used to them."

教育学中的实验方法不仅是研究的工具，更是所有教育实践的基本原则。

But the old man thought only of his steering and his great tiredness. He had gone out too far and the sharks had beaten him. He knew they would leave him nothing but the stripped skeleton of his great catch.

War doesn't negate decency. It demands it, even more than in times of peace.

法律不仅仅是一套规则；它也是一种实践和职业。