妈妈点了点头，“这也是为什么我把所有的蔬菜块都留起来，我都用在我们的花园里。”

Mom nodded, "That is also why I save all those vegetable bits, I use them all in our garden."

youdao

没人确切知道为什么青春期是人类独有的。

No one knows for sure why adolescence is unique to humans.

《柯林斯英汉双解大词典》

你为什么没来呢？其他所有的人都来了。

Why didn't you come? Everybody else was there.

《牛津词典》

I mean, if the energy is lower to occupy a smaller volume, then if I have this room and a bunch of molecules of oxygen, and nitrogen and what have you in the air, and there are weak attractions between them, why don't they all just sort of glum together and find whatever volume they like.

我的意思是，如果占据小的体积会使能量降低，如果我有这样一个空间,和一些氧气，氮气和其他空气中有的气体，并且分子之间还有微弱的相互作用，为什么他们不黏在一起,然后占据他们所想要占据的体积。

麻省理工公开课 - 热力学与动力学课程节选

We're trying to understand exactly what changes in your brain when you learn and how those changes persist over time to support memory. And one thing that we know which helps explain why some things are easier to remember than other is that learning is not a unitary process.

我们一直都想查明，学习的时候，大脑到底发生了什么变化，这些变化是如何长时间控制记忆的,我们都知道，学习的过程不是一元化的,这就是为什么有的东西好记，有的东西难记。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选