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.

双重思想意味着在头脑中同时持有两种相互矛盾的信念，并接受它们两者。

If you're going to try, go all the way. Otherwise, don't even start.

If you don’t go after what you want, you’ll never have it.

Sometimes it’s the people no one imagines anything of who do the things that no one can imagine.

我不是解放者。解放者不存在。人民自己解放自己。