在以边界表示的实体造型中，如果为某实体元素保存部分的邻接实体元素，这便导致了部分关系的拓扑结构。

In the solid modelling of boundary representation, if we store part adjacent entities for some entity, for example, a first edge for a face, topology structures from part relationships will result.

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文中任意形体的3d变形算法能很好地解决具有不同拓扑结构的3d边界表示的物体之间的变形问题。

The 3d morphing algorithm of arbitrary shaped objects in this paper can well resolve the problem of deformations between 3d boundary-represented objects having difference structure of topology.

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在以边界面表示的体造型系统中，难以设计这些复杂结构。

These structures are hard to design by traditional boundary modeling system.

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