如果队列中的令牌超过20个，颜色将变为红色以指示重大的任务积压。
If more than twenty tokens are in the queue, the color goes to red to indicate a large back-up.
Step 1的两个实例是活动的，其他传入令牌必须在该任务前面的队列中等待。
Two instances of Step 1 are active, with the other incoming tokens having to wait in the queue in front of the task.
如果存在正在等待的请求，那么令牌将分配给下一个请求，并且将该请求从队列中删除。
If there are requests waiting, the token is assigned to the next request, which is removed from the queue.
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