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VOA: standard.2010.06.01

I have shown you yesterday that the speed of the particle as it goes around the circle is this .

我昨天讲过,质点做圆周运动的速率等于这个

耶鲁公开课 - 基础物理课程节选

Sure. I think that Columbus Circle is probably one of the most fashionable places in the city.

当然可以。我觉得哥伦布环岛可能是这座城市里最时尚的地方之一。

这里的快乐时光 - SpeakingMax英语口语达人

So in hydrogen atom a, I'll depict that here where the nucleus is this dot, and then the circle is what I'm depicting as the wave function.

在氢原子A里，我在这里把原子核画成一个点，这圆就是波函数。

麻省理工公开课 - 化学原理课程节选

And we bring that prejudice to bear on our interpretation of the line, then that is a constructive way into the circle according to Heidegger and Gadamer.

我们把我们的先见带入了我们对诗句的解读，按照海格德尔和伽达默尔的意思就是,良性的循环。

耶鲁公开课 - 文学理论导论课程节选

Now to start with, the plasmid is usually shown in a diagram like this as a circle.

首先要说的是,质粒通常用图中这个环形来表示

耶鲁公开课 - 生物医学工程探索课程节选

It's related to the frequency with which you go around the circle Why is that?

它也跟圆周运动的频率有关,为什么呢

耶鲁公开课 - 基础物理课程节选

These are some minor characters who lived with them and went to Columbia with them, or were in their circle when these writers lived in the neighborhoods ] in New York around Columbia University.] So, Allen Ginsberg is Carlo Marx, and Ginsberg went to Columbia.

这些是和他们住在一起的次要人物,和他们一起去了哥伦比亚的，或者当作者住在,纽约哥大附近的那个小区时,是他们圈子里的人],因此，艾伦金斯堡就是卡洛马克思，金斯堡去了哥大。

耶鲁公开课 - 1945年后的美国小说课程节选

But the speeches of Glaucon and Adeimantus, you might say the circle around Socrates is effectively closed.

但，Glaucon，与，Adeimantus，的发言，你也可以说,那环绕着苏格拉底的圈子实际上是封闭的。

耶鲁公开课 - 政治哲学导论课程节选

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

Okay. For those who have not seen a radian, it's just another way to measure angle with the understanding that a full circle, which we used to think is 360 degrees, So a radian is roughly 60 degrees.

我想告诉那些还不懂弧度制的同学,这是衡量角度的另一种方法,理解起来是这样的,对于一个整圆,也就是我们之前所说的360°,所以1弧度大约是60°

耶鲁公开课 - 基础物理课程节选

Suppose the particle is not moving in a circle, but does this.

假设这个质点不是做圆周运动,而是这样

耶鲁公开课 - 基础物理课程节选

That means the acceleration is pointing towards the center of the circle and it has a magnitude a.

也就是说加速度,始终指向圆心,其模长为 a

耶鲁公开课 - 基础物理课程节选

v^2 / R is the acceleration directed towards the center of that circle.

^2 / R 就是指向那个圆心的加速度

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