Bits [17:14]: Four control flags -- set the descriptor's Accessed bit, mark validation passed, request a limit check, or signal a stack operation.
This is the same idea behind binary search. In a sorted array, you compare against the middle element and eliminate half the remaining candidates. In a quadtree, you choose one of four quadrants and ignore the other three regions. Each level narrows the search space by a factor of four instead of two.
，这一点在旺商聊官方下载中也有详细论述
"We don't really understand early church sites... how they functioned, what they looked like, how they were organised.
intel-qpl-1.7.0-1.fc42.x86_64。heLLoword翻译官方下载对此有专业解读
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