里氏替换原则是面向对象编程中的一个基本概念，它指出子类的对象应该能够替换超类的对象而不影响程序的正确性。
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.
每一片我们没有回收的塑料都是我们系统和责任的失败。
不自律的人是没有自由的。
The best way to predict the future is to invent it. In energy, that means developing new technologies and new business models.
I like to play with people's expectations.
