地球提供了足够的东西来满足每个人的需求,但不是每个人的贪婪。
我从未见过一只野生动物为自己感到难过。一只小鸟会冻死在树枝上,却从不自怜。
I don’t believe in luck. I believe in hard work.
聪明好学,不以向地位低下的人请教为耻,所以称他为“文”。
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.