The Adjacency Matrix of the Directed Graph is easy to build, but the reach-relation of factors is more useful when building the structure model.
有向图的邻接矩阵比较容易建立，但是在建立结构模型时，更有用的是要素间的可达关系。
The Adjacency Matrix of the Directed Graph is easy to build, but the reach-relation of factors is more useful when building the structure model.
有向图的邻接矩阵比较容易建立，但是在建立结构模型时，更有用的是要素间的可达关系。
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