The class acquisition of expression mode semantics, projection relationship semantics and dimension constraint semantics, and integration acquisition technology of tangency combined relationship, interpenetrate combined relationship and intersectedcombined relationship are emphatically introduced, which lay the foundation for further primitive recognition.
重点介绍了表达方式语义、投影关系语义和尺寸约束语义的分类获取技术，以及相切组合关系、相贯组合关系、截交组合关系语义的整合获取技术，为后续基元体信息的识别、理解和获取奠定基础。
参考来源 - 基于多粒度的产品信息获取技术研究By using the geometric constraint, the dimension constraint, the dimension equation and the dimension driving techniques of CAD, the typical simulation mechanisms are created.
采用CAD的几何约束、尺寸约束、尺寸方程和尺寸驱动技术，针对根据一些典型平面多自由度机构，构造出相应的模拟机构。
参考来源 - 平面多自由度机构运动分析的计算机模拟逼近法及应用·2,447,543篇论文数据，部分数据来源于NoteExpress
讨论了总体尺寸约束下的性能优化问题。
Performance optimization is performed based on the overall size constraints.
估算边界层厚度，为测量器件的设计提供尺寸约束。
The thickness of the boundary layer was estimated to propose the design constraint of the measure sensor.
尺寸约束处理主要解决尺寸树建立和尺寸约束图形链的形成。
The processing of dimension restriction mainly resolves the building of the dimension tree and the graphic list of dimension restriction.
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