一个飞盘是有边缘，所以可以，让它绕着边缘上某点旋转，就像这样，绕边缘点转动它。
A Frisbee has this rim so you can actually try to make it rotate around the point on the circumference by holding it near the rim and spinning it there.
特别地，绕平面上一点旋转物体，同样可以想象，旋转一个实体。
In particular, we have been rotating things about just a point in the plane What you could imagine also is instead you have your solid.
如果在这里取一个点，它会绕x轴上一点旋转。
If you take this point here, it is going to go in a circle like that centered on the X-axis.
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