We made two slits for the eyes and a perpendicular line for the nose.
我们划了两道缝儿做眼睛,一条竖线做鼻子。
For section displays, the cutting plane is assumed to be perpendicular to this line.
为显示指定一个浏览方向，切割平面假设与这条线垂直。
The plumB line is always perpendicular to the horizontal plane.
铅垂线总是垂直于水平面的。
The plane perpendicular to another line or plane through the origin.
与已知直线或平面垂直的平面；
Rolling direction perpendicular to the plane of the bus for the straight line roller.
在垂直于滚动方向的平面内的母线为直线的滚道。
Rolling direction perpendicular to the plane of the bus for the straight line roller.
在垂直于滚动方向的平面内的母线为直线的滚道。
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