在数据包等待交换结构服务的时候，有可能需要等待，为了避免线头阻塞（head of line blocking，HOL blocking）和满足不同数据包的QoS要求，需要等待的数据包有可能要进入不同队列。
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This problem is commonly referred to as head-of-line blocking.
这个问题统称为 head-of-line blocking（对头阻塞）。
Head-of-line blocking exists in input queuing used by ATM switching element , which severely affects the throughput , and the cell lo ss is also very large.
ATM交换单元采用的输入排队由于存在队头阻塞严重影响了吞吐率，并且信元丢失率也很大。
It found a hiding place, so I took the head while shooting indiscriminately, then, the house smoke everywhere, blocking my line of sight, "the spider will not then take the opportunity to attack me?"
它找了个地方藏了起来，于是我拿着喷头一阵乱射，这时，屋子里四处都是烟雾，挡住了我的视线，“蜘蛛不会这时趁机来偷袭我吧？”
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