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The routers get involved in this and they know that on the path between this router and that router a certain percentage of the bandwidth is reserved to these things and a certain percentage of it is allowed on a first come first served basis.
路由器参与其中，它们知道在这个路由器和那个路由器之间的路径上，一定比例的带宽被预留给这些东西，一定比例的带宽被允许以先到先得的方式使用。