Paper brief introduction commodity sale system development situation, some basic design concept, system development environment.

论文简要的介绍了商品销售系统的开发情况, 一些基本的设计思想, 系统的开发环境.

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During the development of concept system, the low level representations are redescripted to high level representations.

该假设提出了一种拥有四个不同水平表征, 由低水平表征不断重述为高水平表征的概念系统发展过程.

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