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.
It's not about being the best, it's about being better than you were yesterday.
真正的冲突在于个人的权利和社会的权利之间。
现在你们不是国人的勇士，怎么能既学好学业又学好射箭呢？
"The only real voyage of discovery consists not in seeking new landscapes, but in having new eyes."