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.

瀑布歌唱著：「虽然渴者只需少许水便足够，我却乐意给与我的全部。」

Science is the poetry of reality.

简单是终极的复杂。

Mathematics is not a careful march down a well-cleared highway, but a journey into a strange wilderness, where the explorers often get lost.