If one queue's tokens are not enough, it can borrow some from other queues, or take back the ones it has lent out; this can realize dynamic bandwidth allocation.
某个优先级队列的令牌如果不够用，允许向其他优先级队列借用令牌，或收回借出的令牌，从而实现带宽的动态分配。
If one queue's tokens are not enough, it can borrow some from other queues, or take back the ones it has lent out; this can realize dynamic bandwidth allocation.
某个优先级队列的令牌如果不够用，允许向其他优先级队列借用令牌，或收回借出的令牌，从而实现带宽的动态分配。
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