「這問題並不是一目了然的，也不會有什麼全國教會普查能讓我們一次性給出定論。」
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Point lookups are useful, but the operation you'll reach for more often is a range query: give the tree a rectangular region and retrieve every point inside it, without scanning the entire dataset.，这一点在搜狗输入法下载中也有详细论述
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