The motion transformation is not necessary coplanar, nor must it be concentric.
运动的变换不是必须共面的，也不必须是同心的。
We are two different planes straight line, never intersect, and even harder to coplanar!
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!
我们是两条异面直线，永远不会相交，甚至很难共面！
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