未来的逐渐取消伴随着期望的萎缩。
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。
Success is not accidental, but inevitable.
The most rewarding part of research is seeing your work translate into real-world impact.
We believe that the cars of the future will definitely be electric.
States are rational actors that seek to maximize their relative power in order to ensure their survival in a competitive international system.
Believe you can and you're halfway there.
冬天已经到来，春天还会远吗？