这是比较微妙的，可以找出与所有平面平行的直线方向。
So, at some point we saw other subtle things about how to find the direction of this line that's parallel to all the planes.
而当X线光束与骨裂开的平面平行的时候，左右的骨折都可以被鉴别出来。
The fractures in all the specimens were clearly visible when the X-ray beam was parallel to the plane of osteotomy.
这个平行四边形仍然有相同的面积，它仍然在同一个平面上。
The parallelogram still has the same area, and it's still on the same plane.
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