做你自己，因为别人已经有人做了。

回忆和期待一样，是一种简化和剪辑现实的工具。 《旅行的艺术》

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.

Man is not the creature of circumstances; circumstances are the creatures of men.