还有一种方法就是将兴趣类似的人整合到一起，这也就是所谓的兴趣邻居(taste neighbors)。这种方法在垂直社交网络中非常普遍，例如Last.fm、Flixster和Goodreads等。
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她饶有兴趣地对邻居们的活动说三道四。
她对此非常感兴趣，决定向邻居学习。
She was so interested in it and decided to learn from her neighbor.
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.
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