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Every Tuesday, Guardian rugby writer Robert Kitson gives his thoughts on the headlines, scrutinises the latest matches and provides gossip from behind the scenes in his unique and indomitable style. See the latest edition here.，这一点在夫子中也有详细论述
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.