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.
（作者注：阿莱创立于1917年，总部位于德国慕尼黑，是领先的电影摄影机、数字中间片和照明设备的设计、制造与销售商。）
，这一点在搜狗输入法2026中也有详细论述
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