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.

"The novel is the great adventure of the mind."

人生短暂如白马过隙，若不及时享受生活，年老时只能空自悲伤。

一个和谐的社会，不是争议的消失，而是公义的彰显。