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.
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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