一个惯例是：鼓励最慢的一位走队首，以使整队以他的速度前进。
A common custom is to encourage the slowest hiker to hike in the lead and have everyone match that speed.
说罢，他让最后两个人站到队伍里，然后自己朝队首走去，边走边数着人数。
Therewith he lined up the last two and proceeded to the head, counting as he went.
通过对RED算法及ECN算法进行研究分析，提出了一种带优先级的队首标记的拥塞控制算法。
After researching RED and ECN algorithm, a head-signed congestion control algorithm was raised based on ECN and priority.
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