And, the bottom line in modeling is make it only as complex as you need to.

模型构造的底线是,根据你的需要尽量把它弄得复杂。

麻省理工公开课 - 固态化学导论课程节选

And the brain is a remarkably beautiful and complex structure involving cortex, the cortex has maybe over 50 billions neurons and each one is connected to a thousand others and so forth.

大脑的构造漂亮，复杂，让人惊叹,大脑有皮层，皮层中的神经元多大500亿之多,每个神经元都与数亿千计的其他神经元相连。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选