The spatial view (the grid of rectangles) and the tree view (the hierarchy of nodes) represent the same structure. Searching for a point means walking down the tree: at each node, you check which of the four children contains your target coordinate and recurse into that child. You never visit the other three.
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Escaping the guest kernel requires finding a vulnerability in the Virtual Machine Monitor’s device emulation or the CPU’s virtualization features, which are rare and highly prized.，这一点在服务器推荐中也有详细论述
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