按照唯物主义实践观，高度抽象概括出系统的三个构成要素：实践主体、实践客体和信息。为训练计划管理系统的设计与开发奠定了良好的基础。

On the basis of the practical outlook of materialism, it generalized the three factors of the system: subject of practice, object of practice and information.

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地图要素与地图符号类型之间的关系长期被人们忽略。但它确是专题地图设计专家系统中不可缺少的重要环节，是地图符号设计的基础。

The relationship between map element and map symbol, which is the important key link of Thematic Map Design Expert System and the basis of map symbol design, has always been ignored.

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