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.
Purple: Double____
，这一点在体育直播中也有详细论述
美以伊戰爭第四天焦點：以色列大規模空襲德黑蘭、貝魯特「軍事目標」，更多细节参见搜狗输入法
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