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.
在欧洲，17世纪贵族私人游艇已成风尚。美国游艇产业在19世纪中后期已逐步兴起，二战后进入高速成长期，形成集制造、销售、维修、服务于一体的完整工业体系。
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适用：数据均匀分布，如[0,1)之间的浮点数