模型的目的是足够简单以便理解和使用,但又足够复杂以捕捉系统的基本特征。
To one who has faith, no explanation is necessary. To one without faith, no explanation is possible.
被别人用他们认为是坏名字的称呼并不是侮辱。这只是表明那个人有多可怜,它不会伤害你。
You have to believe in your idea and be willing to persist through a lot of challenges.