消除多级逻辑结构中冗余的逻辑连线、冗余逻辑门并进行相应的等价逻辑结构变换，实现多级逻辑优化。
Multilevel optimization is implemented by a series of logic structural transformations which delete the redundant lines and gates to improve some local structures.
该逻辑方式中，数据单元的多级结构类似一棵“倒立”的树，该树的树根在顶部，而树枝向下延伸。
In this logical approach, data units are structured in multiple levels that graphically resemble an "upside down" tree with the root at the top and the branches formed below.
该逻辑方式中，数据单元的多级结构类似一棵“倒立”的树，该树的树根在顶部，而树枝向下延伸。
In this logical approach, data units are structured in multiple levels that graphically resemble an "upside down" tree with the root at the top and the branches formed below.
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