The way we like to do that is to tap into the region of the brain called pre-motor cortex.

我们要做的是接入大脑,一个叫做运动前区皮质的区域。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

Well, right now, what we do out here is we do a little bit of stretch and handstands.

嗯，现在呢，我们在这儿做点儿伸展运动和倒立。

圣莫妮卡的 DJ - SpeakingMax英语口语达人

Quite often, it's natural to pick x and y in a certain way, because starting a projectile near the Earth, it makes sense to pick the horizontal as x and vertical as y.

我们经常会很自然地选取 x 轴和 y 轴,因为如果在地表附近做抛物运动,我们通常以水平方向为 x 轴,竖直方向为 y 轴

耶鲁公开课 - 基础物理课程节选

What kind of exercise can we do on Santa Monica Beach?

我们在圣莫尼卡海滩能做什么运动？

激情生活 - SpeakingMax英语口语达人

We do some exercise, dips, pull-ups,

我们做一些运动，仰卧后撑，做引体向上。

圣莫妮卡的 DJ - SpeakingMax英语口语达人

The fact that when you go in a circle, you accelerate is what we're learning here, coming from the fact that velocity is a vector and its change can be due to change in the magnitude or change in direction.

而当你做圆周运动时你也在加速,这是我们在这里所学到的,原因就在于,速度是一个矢量,其变化可以通过改变模长,或者方向来实现

耶鲁公开课 - 基础物理课程节选

So what we would like to do is to describe what the object does by drawing a graph of time versus space and the graph would be something like this.

然后我们要做的就是描述这个物体的运动,通过画一个"x-t"图,画出来的图就像这样

耶鲁公开课 - 基础物理课程节选

We know it's going around in a circle because if I find the length of this vector, which is the x-square part, plus the y-square part, I just get r square at all times, because sine square plus cosine square is one.

我们之所以知道它做圆周运动,是因为我求出了这个矢量的模长,也就是 x 的平方加上 y 的平方,我就得到了它在任意时刻的模长平方,因为正弦平方加余弦平方始终等于1

耶鲁公开课 - 基础物理课程节选