The three - dimension system structure consists of life cycle level , diagram level and model level.

其三维 立体 体系结构由生命周期维 、 视图维和模型层次维组成.

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However, the top - level diagram is extremely large, resulting in very large data and diagram memory components.

但是, 顶层程序框图非常大, 数据和框图都将占用较大的内存区域.

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