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.
最大的荣耀不在于从不跌倒，而在于每次跌倒后都能站起来。
"History is not just about the past; it's about how the past shapes the present."
一个人越是有许多事情能够放得下，他越是富有。