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.

数学不仅仅是一种工具；它是一种思维方式。

我们之所以能够感知事物的变化，是因为单子在无限的变化中保持了稳定的内在本质。

To understand the mind, study its operations in real life.

旅程本身就是奖励。