And that linear velocity, which, in this case, is really your speed, is of course the circumference of the circle divided by how many seconds it takes to go around.
线速度，在这个例子里，就是速率，是这个圆环的周长，除以走一圈，需要的秒数。
Instead of just somewhere,maybe I will have the origin,and I am trying to make it go around the origin in a circle at a certain angular velocity.
特别地，取原点,让物体以一定的角速度，围绕原点旋转。
I taught her to run around in a circle, to go one way then turn around and go another.
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。
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