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.
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而早已去世的爷爷奶奶却不同。小时候，奶奶睡前给我讲民俗故事，讲到《半夜鸡叫》时学周扒皮“咯咯咯”地笑，我也跟着笑。她用箬叶包粽子，用玉兰花泡酒，一遍遍做我爱吃的番茄炒蛋，直到那道菜让我生出厌倦。爷爷虽然吝啬，也会在午睡前给我留下几块零花钱，在春节时给我买烟花和零食。