只对每个位置的邻居总数感兴趣，不需要详细的邻居列表，所以对每个位置的结果进行分组，并只要求计数。
You're only interested in the total number of neighbors for each location, not the detailed list of neighbors, so group the results for each location and only ask for a count.
从我的理解，有一个同行解析器维护一个注册列表(假设一个全新的节点上线)，然后他的地址的最近的邻居连接到。
From what I understand there has to be a peer resolver to maintain a list of registrations (assuming a brand new node comes online) it then hands addresses of its closest neighbors to connect to.
追踪服务器，通过按域划分邻居节点列表，优化了对邻居节点的返回策略。
For optimizing the returning policy of the neighboring nodes, the tracker server divides the neighboring nodes in accordance with the domain.
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