里氏替换原则是面向对象编程中的一个基本概念，确保派生类可以替代其基类使用，而不会改变程序的正确性。
The Liskov Substitution Principle is a fundamental concept in object-oriented programming, ensuring that derived classes can be used in place of their base classes without altering the correctness of the program.
"The most important thing is to stay disciplined."
任何真正新颖的东西都是在一个人的青年时期发明发现出来的，当一个人变得更有经验，更有名，也更顽固。
"The first draft is just you telling yourself the story."