这样做了以后，要使优先级队列中在任意时刻只保持一条从树中顶点到某边缘点的边就变得容易了。
As it turns out, it is easier to keep only one edge from the tree to a given fringe vertex in the priority queue at any given time.
同时边缘路由器组装和分配信道缓冲区设置和优先分配机制可以影响到输出光突发包的长度和突发度。
By properly designing of the assembly and scheduling mechanism of the edge router, the output traffic shape can be improved and delay requirement is satisfied simultaneously.
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