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.

懒惰是所有恶习的开端，所有美德的王冠。

对公共事务漠不关心的代价是被恶人统治。

我不后悔我的过去，我只是后悔在错误的人身上浪费时间。

Science is not only a discipline of reason but also one of romance and passion.