MG：主几何

“Master Geometry”在工程与制造等综合领域中常被简写为“MG”，以提升书写与使用效率。该术语的中文释义为“主几何”，通常指产品设计中的核心几何结构或基础模型，在零件设计、装配及质量控制等环节具有关键作用。

A second generation mold requires a master model geometry that is a mirror image about the part design surface as described in the schematic below.
第二代模具要求原模的几何形状是部件形状的镜像。
To master in time the status of railway track geometry under repeated train loads, modern track inspection car and computer processing techniques are adopted to inspect it and evaluation standards concerned are established in many countries.
为了及时掌握列车反复荷载作用下的轨道几何形位状态，各国铁路管理部门都采用了现代轨检车和计算机处理技术来监测其变化情况，并制定了相应的评价标准。
This master model is a full-scale representation of a part design that incorporates all of the geometry for one of the part surfaces.
原模应以同样比例大小展现部件表面的形状设计。
In this paper equation of four sorts of the curve are derived which result from K dimension component of radial error motion of master sphere center and indicate plane rotary motion characteristic of rotating axle, and their geometry are simply discussed.
本文首先推导出由标准球心径向误差运动中K次分量而产生的表征转轴平面回转运动特性的四种曲线方程，并简单地讨论了它们的几何形状。

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