Happiness lies not in what we have, but in what we enjoy.
God is in his heaven—All's right with the world!
The Liskov Substitution Principle is a fundamental concept in object-oriented programming, stating that objects of a superclass should be replaceable with objects of a subclass without affecting the correctness of the program.
Man is the measure of all things.
当最后一条鱼被捕捞，人类才会明白金钱不能当饭吃。
You are not only responsible for what you say, but also for what you do not say.
