在澄海的那个上午，德国时间刚至清晨，杜耀豪拨通了母亲的电话。电话那头，传来了她已很少使用却依然纯正的澄海方言，与林木通的儿子缓缓交谈。她问起自己外祖父母的职业，对方可能并不清楚，未能答出。
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The pruned nodes (in red) represent entire regions of space that the algorithm never examines. The points inside those regions are never checked. Compare the "Nodes Visited" count to the total number of points. The quadtree is doing far less work than a brute-force scan.