算法基于双向式搜索原理，采用投影法、夹角最小的方法及二叉树理论。
The algorithm takes advantage of the theories of bidirectional search, projection, minimum Angle and binary tree.
在源特定组播，路径(也称为树)产生(或根植)在一个单一的定义来源，而双向数据源特定PIM不是。
In source-specific multicast, paths (also called trees) originate (or are rooted) at a single, defined source, whereas bidirectional PIM is not source-specific.
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