Instead it is more like a multi-level map data structure.
取而代之的是多级映射的数据结构。
The multi-level control structure is also established on the basis of hierarchical control structure.
并在大系统递阶控制结构的基础上，构建了模型体系的多级控制结构。
The multi-level control structure is also established on the basis of hierarchical control structure.
并在大系统递阶控制结构的基础上，构建了模型体系的多级控制结构。
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