... 沿垂线 plumb line 真垂线 true-perpendicular; true-vertical 正垂线 horizontal-profile line ...
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PROFILE: The true picture of a surface in relation to a horizontal line; a contour of a designated surface of a cup, cone, or roller.
型面轮廓：与水平线相比表面的实际轮廓线；实际设计的外圈，内圈或滚子的轮廓线。
The projecting lines are discussed by using the line of intersection in horizontal ( H ) plane, profile ( W ) plane and frontal ( V ) plane.
并讨论相贯线在水平（H）面，侧立（W）面，正立（V）面上的投影线。
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