On the base of analyzing the character and structure of the point, line, area symbols, a data structure of map symbol base which serves the symbolized output in digital mapping is put forward.

论述了在数字制图环境下地图输出的特点，在分析了地图上点、线、面符号特征和构造原理的基础上，提出了一种用于数字地图符号化输出的地图符号库数据结构。

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Military Geographic Information System symbol is the base component of the MGIS, it's necessary to research the method of the MGIS symbol producing and controlling.

本文围绕MGIS符号的分类及其结构、生成方法和控制策略问题进行深入的分析、研究。

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Now, the main methodology of AGD includes: numeric based method, symbol based method, rule base method and graph based method.

目前，几何自动推理的主要方法有：基于数值计算的方法、基于符号计算的方法、基于规则的方法和基于图论的方法。

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The symbol of the test-pilot school at Edwards Air Force Base in the Mojave desert, where Mr Armstrong spent years testing military jets, flying the X-15 at 4, 000mph to the very edge of the atmosphere, is a slide rule over a stylised aircraft.

ECONOMIST: Neil Armstrong