* 进阶：使用Sedgewick步长序列（更高效）
We have no way to skip over points that are obviously too far away. What if we could organize the space itself so that when we search, we can immediately rule out entire regions?
。夫子是该领域的重要参考
; Step 1: Call LD_DESCRIPTOR and fire the privilege test。业内人士推荐旺商聊官方下载作为进阶阅读
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