模型的三种基本类型：几何相似模型、结构相似模型、功能相似模型；
Three basic types of model, j. e. geometricsimilar model, structural similar model and functional similar model;
基本体形状描述采用八点坐标法。基本体还应定义四种属性，即几何、类型、区域、虚实。
The basic body's shape can be described by defining it's coordinates of 8 corners and it is also important to define the basic body's geometry, type, region and ghost.
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