该程序用于读入.STL格式的文件，并将其存入到一个链表中。-the procedures to be used for reading. STL format of the document, and save them to a chain list.

一个自行开发的图形底层程序。十分有价值。已经完成的部分含有矢量图形的放大缩小等视图操作，基本的几何数据组织。使用STL开发-a self-developed graphics bottom procedures. Very valuable. Already completed parts containing vector graphics, etc. Zooming View operation, the basic geometric data organization. STL use

CAD中求取模型的截面，通常截面可以通过STL类模型转化，但CAD有自己的截面功能-CAD model to strike a cross-section, usually cross-section through the STL model into categories, but the CAD cross-section has its own function