—— 请按键盘 空白键 开始游戏 ——

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.
你把两个从未在一起的人放在一起;有时世界会改变,有时不会。他们可能会崩溃和燃烧,或者他们可能会点燃并照亮天空。
My heart, the bird of the wilderness, has found its sky in your eyes。