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提出了用于几何造型的广义力的概念，定义了相似曲线并证明了有关推论．给出了合成子特征多边形的方法．这个特征多边形依赖于广义力，并且是由其双亲特征多边形调合得到的
The concept of generalized forces for geometric modeling is proposed, similar curves are defined and the corollary is proved. A method of synthesizing sub-feature polygons is given. This characteristic polygon depends on the generalized force and is obtained from the polygons of its parents