圆周上各点离圆心的距离相等。

All points on a circle are equidistant from the centre.

《牛津词典》

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.

youdao

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.

youdao

You can take circles of different size and place them against your trajectory and see which one fits.

你可以做不同大小的圆周运动,然后把它们放到你的轨迹上,看哪一个匹配

耶鲁公开课 - 基础物理课程节选

We're describing the motion of a particle in a circle.

我们描述了圆周上一个点的运动

耶鲁公开课 - 基础物理课程节选

When a particle moves in a circle, it has an acceleration towards the center of this size, v^2 over R.

当一个质点在圆周上运动时,它有一个指向圆心的加速度,v^2 / R

耶鲁公开课 - 基础物理课程节选