里氏替换原则是面向对象编程中的一个基本概念,它指出子类的对象应该能够替换超类的对象而不影响程序的正确性。
去做对他人有益的事情。
Freedom is not the power to do what we want, but the right to do what we ought.
The time to start investing in your career, your relationships, and your identity is now.