一个节点可能请求来自另同侪的一个服务，或节点可能事实上提供一个如此服务给系统的其他的同侪。
A node may request a service from another peer, or the node may in fact provide such a service to other peers in the system.
一个节点可能请求来自另同侪的一个服务，或节点可能事实上提供一个如此服务给系统的其他的同侪。
A node may request a service from another peer, or the node may in fact provide such a service to other peers in the system.
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