Knowledge expression model is one of the kernel parts in the Virtual Environment Railway Location System.
知识表达模式是虚拟环境选线设计系统实现智能功能的关键部分。
Combining with the applied request of Virtual Environment railway Location System, the technique of inquiring, reappearing and using of the railway structure 3d model base is researched.
结合虚拟环境选线系统中的应用要求，探讨了铁路构造物三维模型库的访问、再现和利用技术。
As an important part of virtual environment railway location design system, railway location engineering database management system is base of storing information and tool of dealing with information.
“铁路选线工程数据库管理系统”作为“虚拟环境铁路选线设计系统”的一个子系统，既是它的信息储存基地，又是它的信息处理工具。
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