其中基础类包是应用类包和组合类包的基础，它用点、线、面、体、复杂对象和关系类等基本的要素表示三维空间。

The base package including point class, line class, area class, volume class, complex object class and relation class, is the base of the application package and the combination package.

youdao

其中基础类包是应用类包和组合类包的基础，它用点、线、面、体、复杂对象和关系类等基本的要素表示三维空间。

The base package including point class, line class, area class, volume class, complex object class and relation class, is the base of the application package and the combination package.

youdao