对零件特征按加工过程中几何拓扑结构以及功能进行分类和定义。
The part features were classified and defined according to the geometric topology and functions in part machining.
系统级的凝聚特征将设计知识、几何形状以及联接关系等封装起来，克服了传统特征在功能语义表达上的不完备性。
Encapsulating design knowledge, geometry form and conjunction relationship, the agglomerated feature in system-level is generated to maintain the whole semantic elements of a function.
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