The B-tree is a generalization of a binary search tree in that a node can have more than two children.
树是二叉搜索树的泛化，其节点可以具有多于两个的子节点。
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By the B-cut sets and the probabilities of the nodes of Binary Decision Diagrams (BDD), a new quantitative analysis algorithm of coherent fault tree based on BDD is presented in this paper.