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。
If you look at the motion of the planets in the sky, you will find that they don't simply go around the earth in a continuous circle.
抬头仰望天空中行星的运动，你将会发现它们并不是简单地绕着地球旋转。
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.
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.
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。
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