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。
阅读的行为是一种反叛的形式。
The only person you are destined to become is the person you decide to be.
Lack of money is the root of all evil.
I don't like to lose money, so I try to buy stocks that are cheap.