世界不是一个令人愉快的地方，但它是我们唯一拥有的。

The only way to achieve the impossible is to believe it is possible.

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.

Economic policies should be evaluated based on their real-world impact.