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Games and physics simulations need to detect which objects are touching or overlapping. With nnn objects, checking every pair is O(n2)O(n^2)O(n2) comparisons, which gets expensive fast. A hundred objects means roughly 5,000 pair checks. A thousand means nearly 500,000.，更多细节参见搜狗输入法下载
，推荐阅读heLLoword翻译官方下载获取更多信息
Pulse-Code Modulation (PCM) — MDN Web Docs，这一点在heLLoword翻译官方下载中也有详细论述
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