圆周上各点离圆心的距离相等。
地球的圆周约为25,000英里。
我必须有很多波长才能绕这个圆周。
I have to have a whole number of wavelengths to get around the circumference.
现在所有的质量都在圆周上，现在它会花更多的时间。
Now all the mass is at the circumference, and now it takes more time.
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.
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.
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".
圆周内两直径必相交。
我教她在一个圆周中的附近跑，然后去一个方法回过头而且去另外一。
I taught her to run around in a circle, to go one way then turn around and go another.
所以所有的材料都是在圆周上，现在它会花更多的时间。
So now all the mass is at the circumference, and now it takes more time.
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.
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.
上述函数决定离开圆周的偏移量和各线段的长度。
The functions above determine the offset from the circle edge and length of each line.
什么是匀速圆周运动？
在太阳系，大多数的行星都各自拥有统一的圆周轨道。
In our solar system, planets for the most part have fairly uniform circular orbits.
先前在讲行星时,我们讨论过这个，我们讨论的是,匀速圆周运动，而且我们评估了,向心加速度。
We have discussed that earlier when we dealt with the planets, and we dealt with uniform circular motions, and we evaluated the centripetal acceleration.
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.
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.
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?
从匀速圆周运动来看。
这是导致速度，沿着圆周改变的因素。
This is the one that makes the speed change along the circumference.
现在我们讲讲匀速圆周运动。
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.
在纯滚动情况下，Q的速度，和圆周的速度，如果你们看得到-，是相同的。
When we have pure roll, the velocity of this point Q, and the velocity of the circumference, - if you can read that — are the same.
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.
它如同圆周一样可靠而规律。
在他之前，人们认为，它们不是做圆周运动。
Before him, people were saying, well, they cannot move in a circle.
质量是小m的,物体围绕着,大M作圆周运动。
There's an object mass little m going in a circle around capital M.
让我设个假设，所有的车轮的物质是在，圆周上的，并不是很准确，但很接近的。
And let me make the assumption that all the mass of the bicycle wheel is at the circumference, which is not very accurate, but it's close to that.
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