圆周上各点离圆心的距离相等。
不要把沿圆周的切向加速度与向心加速度混淆。
Do not confuse ever the tangential acceleration, which is along the circumference, with centripetal acceleration.
假设您想要创建一个放射状的列表框，将其内容沿圆周排列，就像一个旋转木马。
Imagine you want to create a radial list box that arranges its content along a circle, like a carousel.
为了纪念祖，一些数学家建议称圆周率为“祖率”。
In order to remember Zu, some mathematicians suggest calling pi "Zu Lv".
进化论的作者、年轻的英国植物学家查尔斯·达尔文，是第一个看到落叶柏树干圆周长达一百三十英尺的欧洲人。
A young English botanist named Charles Darwin, the author of the theory of evolution, was the first European to see alerces, with trunks that had a circumference of 130 feet.
2010年3月14日：圆周率日。
葡萄酒杯的直径与圆周晃动的宽度的比率；
the ratio of the diameter of the glass to the width of the circular shaking;
他凭记忆背诵圆周率到22 514位。
我们需要把看出一个接一个很小的圆周运动的叠加。
We need to add smaller circular motions on top of each other, and so on.
pai是一个数学常量，代表圆周长跟直径的比值。
It's a mathematical constant representing the ratio of any circle's circumference to its diameter.
如何解释可见行星并不是，连续不断地做圆周运动呢。
How did they explain the fact that the motion of the planets visibly was not just straight consistent circles.
究竟何物把上帝完美的圆周运动替换成了物质的奋斗呢？
Which instead strives to imitate the perfection of God by moving in circles?
它们都在做着圆周运动，必然以其为奋斗目标。
Well, we see those moving in circles, they must be striving to move in circles.
但是别把这个切向加速度，它是沿着圆周的，和向心加速度混淆。
Do not confuse ever the tangential acceleration, which is along the circumference, with a centripetal acceleration.
匀速圆周运动发生在，当物体沿着一个圆环滚动，速率恒定的情况下。
Uniform circular motion occurs when an object goes around in a circle and when the speed never changes.
我跳起来，旋转，绕着每个星球的圆周行进，玩笑般的对付着地心引力。
I leap, I spin, I navigate the circumference of each spherical planet, toying with gravity.
那是因为，至少在圆周长度方面，我们星球上的一些地方比其他的要大。
That's because some parts of the planet are much bigger than others, at least in circumference.
亚里士多德理论都是基于天堂里的物体，做圆周运动这一基础思想而展开的。
Now, the Aristotelian theory, as I said, was based on the idea that all heavenly bodies basically move in circles.
Lehrer：你是如何能背诵圆周率小数点后22514位数的？
LEHRER: How were you able to recite from memory the first 22, 514 Numbers of Pi?
一般一个完美圆周的偏心值为0，而约有一半的系外行星的偏心值在0.25或者更高。
Where a perfect circle has an eccentricity value of zero, roughly half of exoplanets seen thus far have an eccentricity of 0.25 or greater.
然后他很有礼貌地把圆周理论物理研究所的环境比作那些有创新性的强大国家。
He then courteously likened the environment at Perimeter to these powerhouses of innovation.
一开始将电子电荷平方，再除以光速和普朗克常数，然后将总数乘以2个圆周率。
You start with the square of an electron's charge, divide it by the speed of light and Planck's constant, then multiply the whole lot by two PI.
原本是圆周运动，突然间，推力和拉力都没有了，这就会呈螺旋状运动，显然，这是不对的。
You go around in a circle, and all of a sudden you no longer have the pull or the push and you go around in a spiral and obviously, that is not the case.
我们也可以用角度来做参数的，但不是在这个例子里，而是在沿圆周运动或一些类似的情况时使用。
And we could also have used maybe some Angle. Well, not here, but if we had been moving on a circle or something like that.
这是一个向量场，其中旋转轨道是，以z轴为圆心的圆周，并且这个向量场与每个圆相切。
That is a vector field in which the trajectories are going to be circles centered in the z-axis and our vector field is just going to be tangent to each of these circles.
他会尝试用指关节，用一只手掌根压在另一只手背上，网球，背部按摩器，采用直压按摩或圆周按摩。
He can try his knuckles, the heel of one hand reinforced by pressure from the other hand on top of it, a tennis ball, or a back massager, using direct pressure or a firm circular motion.
显然一个，并且只有一个，小小的叶甲才能在这个大头针顶——这张40倍图片上银色的圆周——上跳舞。
Evidently one, and only one, tiny leaf beetle can dance on this pin's head — the silvery circle in this 40 X photo.
有些示例展示了如何将Workers用于执行密集的数学计算，比如计算1万位数的圆周率。
Some Worker examples show Workers being used to perform intense mathematical computations, like calculating ten-thousand digits of PI.
这一环形交叉的圆周长度大约是3.4公里，环绕交叉的道路是波斯兰苏丹萨拉赫丁阿卜杜勒阿齐兹沙阿路。
The circumferential length of this roundabout is approximately 3.4km, and the road that circumvents it is Persiaran Sultan Salahuddin Abdul Aziz Shah. (Link).
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