该造型的特点一是基于特征，其几何信息和工艺信息主要从制造要求出发；

The modelling is based on part feature, its geometry and process information are from the manufacturing requirement.

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因此，基于细胞元模型的语义特征造型已成为当今CAID系统的主要研究的方向之一。

So, the semantic feature modeling technique based on cellular model has become very important in most CAID systems.

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对特征造型方法和基于约束的设计进行了讨论。

The feature modeling and the design based on constraint were analyzed.

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