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.

He who seeks shall find, but he who waits shall receive.

未来属于那些今天种树的人。

Art is a matter of life and death. This could be my last message.

科学不在于正确，而在于减少错误。

Happiness is beneficial for the body, but it is grief that develops the powers of the mind.

音乐是唯一属于我的东西。