南方周末：你在比赛期间，会关注其他选手的表现吗？
Range queries ask "what's inside this box?" But sometimes the question is "what's nearest to this location?" This is the nearest neighbor problem, and you don't know how big your search radius should be. The nearest point might be right next to you or far away.，这一点在safew官方版本下载中也有详细论述
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Let’s hear it for “legs” eleven!