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.

【译文】 孔子说：“富和贵，人人向往，不以正当的方法得到的，不要享受；贫和贱，人人厌恶，不以正当方法摆脱的，不要逃避。君子扔掉了仁爱之心，怎么算君子？君子时刻不会违反仁道，紧急时如此，颠沛时如此。”

The beauty of a structure lies in its logic.