教育并不像在花园里播种一样在我们身上种植能力;它只是引导它们走向应该走的方向。
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.
Art is not what you see, but what you make others see.