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.
陌生人与我们接近，因为我们在他们和我们自己之间感受到民族、社会、职业或一般人类本性的共同特征。他们远离我们，因为这些共同特征超越了他们或我们，并且只因为它们连接了许多人而连接我们。
The best way to learn is by doing, not just by listening or reading.
I'm not interested in competing with anyone. I hope we all make it.
Hope is a good thing, maybe the best of things, and no good thing ever dies.
To create is to resist—to resist silence, to resist forgetting.
真相很少是纯粹的，也从不简单。
Success is not accidental, it requires persistence and hard work.