来自《耶鲁大学开放课程：基础物理第3集第3集》

everything's going to be based on just the laws of Newton.

所有的内容都是基于牛顿定律的
It's really amazing that somebody could condense

能把这么多内容浓缩成
that much information into a few, namely three, different laws.

三条定律真是不可思议
That's what we're going to talk about.

那我们就来研究研究
Let's start.

我们开始吧
Your reaction may be that you've seen Newton's laws,

你们的反应可能是我已经见过牛顿定律了
you applied them in school.

以前在学校就学过
I've got to tell you that I realized fairly late in life

我得告诉你们我是很晚的时候才意识到
they are more subtle than I imagined the first time.

它其实比我之前想象的要精妙得多
It's one thing to plug in all the numbers and say,

我们平时只是把数字代进公式然后说
"I know Newton's laws and I know how they work."

"我懂牛顿定律也知道怎么使用"
But as you get older and you have a lot of spare time,

但随着你们年龄的增长有更多空闲时间之后