求翻译：三维矢量模型是二维中点、线、面矢量模型在三维中的推广。它将三维空间中的实体抽象为三维空间中的点、线、面、体四种基本元素，然后以这四种基本几何元素的集合来构造更复杂的对象。以起点、终点来限定其边界，以一组型值点来限定其形状；以一个外边界环和若干内边界环来限定其边界，以一组型值曲线来限定其形状；以一组曲面来限定其边界和形状。是什么意思？

正在翻译，请等待...

3D vector model is 2D, click, online, the vector model in 3d. It will be in the 3-dimensional space of abstract entities in 3D space, a point, a line, and 4 of the basic elements, and then to the 4 basic geometry elements of the collection to construct a more complex object. The starting point and e

The three dimensional vector model is the two-dimensional center point, the line, the surface vector model in the three dimensional promotion.It abstracts the three-dimensional space in entity as the three-dimensional space in the spot, the line, the surface, the body four kind of fundamental elemen

Three dimensional vector model is a two-dimensional point, line and plane in three-dimensional generalization of the vector model. Its abstract entities in the three dimensional space into three dimensional space point, line, surface and volume four basic elements, and then to the four basic geometr

正在翻译，请等待...