人们买药时撕掉贴在包装上的一个标签，就会得到一串码，然后通过短信形式把它发送到一个计算机系统，通过这个系统可以在数据库中查询到相关信息。

People buying medicine scratch off a panel attached to the packaging. This reveals a code, which they can text to a computer system that looks it up in a database.

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它以地理空间数据库为基础，在计算机硬、软件环境的支持下，对空间相关数据进行采集、管理、操作、分析、模拟和显示。

Based on geographical and spatial database and supported by computer hardware and software context, GIS implements to acquire, manage, operate, analyze, simulate and display spatial data.

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方法：通过计算机数据库检索相关文献，作出综合评述。

Methods: to search the related literatures from the database by computer, then to review them.

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