The packet of same application class come into the same queue, and then are divided into different logical sub-queues by packet priority in the queue.
相同类型应用的数据包进入同一队列，在队列内部按分组的优先级分成不同的逻辑子队列。
When into line with more than one packet arrival and the need for the same output line, or router processing speed slow, then would lead to network congestion.
多条流入线路有分组到达，并需要同一输出线路，或是路由器处理速度慢，那么将导致网络系统拥塞。
When into line with more than one packet arrival and the need for the same output line, or router processing speed slow, then would lead to network congestion.
多条流入线路有分组到达，并需要同一输出线路，或是路由器处理速度慢，那么将导致网络系统拥塞。
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