Losses loom larger than gains in people's minds.
在人们心中，损失比收益显得更大。
Do what you can, with what you have, where you are.
The whole conviction of my life now rests upon the belief that loneliness, far from being a rare and curious phenomenon, peculiar to myself and to a few other solitary men, is the central and inevitable fact of human existence.
里氏替换原则是面向对象编程中的一个基本概念，它指出子类的对象应该能够替换超类的对象而不影响程序的正确性。
数学的进步不仅仅依靠个人的努力，而是通过几代人的集体工作。