运动的变换不是必须共面的，也不必须是同心的。
The motion transformation is not necessary coplanar, nor must it be concentric.
我们是两条异面直线，永远不会相交，甚至很难共面！
We are two different planes straight line, never intersect, and even harder to coplanar!
而1999年报告则没有将上述面积作为公共面积分摊。
And the 1999 report is not the area as a public space-sharing.
当两个物体的面比较接近时，会出现共面的闪烁现象，将大面模型的共面区域掏空。
If the faces of two objects are close enough, the Shared plane will flash.
当两个物体的面比较接近时，会出现共面的闪烁现象，将大面模型的共面区域掏空。
If the faces of two objects are close enough, the Shared plane will flash.
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