The Map Symbol Base System is not only one of the basic functions of Geographic Information System, but also an important research issue in GIS.
地图符号库系统不仅是地理信息系统中不可缺少的基础功能模块之一，也是GIS的一个重要研究课题。
The base rendering was pretty brutal. However, I was just looking for a rendering with soft shadows and some basic texture information.
基础渲染非常不合逻辑，但是，我只是采用柔和阴影和一些基本的纹理进行渲染。
The basic function, constructing way and information searching workflow of sub-module were studied, which provide base for development of learning module of virtual printing problems training system.
通过研究子模块的基本功能、构建方法和信息检索流程，为虚拟印刷故障培训系统学习模块的开发奠定基础。
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