Life is a horse，and either you ride it or it rides you.
当没有人相信你时，你必须相信自己。
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.
Everything is a learning process: any time you fall down, you get up and you learn from it.
最好的矿藏往往出现在别人停止寻找的地方。
The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.
