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为了与工程实际相符合，本文采用三维实体建模，几何尺寸与工程实际相符；
Three-dimensional solid modeling method is introduced in this paper for good result, and the geometrical size of the model is consistent to the true value.
借助MDT三维实体建模系统和面向对象的编程技术实现特征建模的系统原型。
Finally, the system prototype for the feature modeling is realized in the MDT system.
本文提出了基于变量和表达式定义的三维实体建模方法，并采用这个方法实现了一个模板工具。
The thesis develops a method of solid modelling based on defining variables and expressions and implements a template tool.
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