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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Step 3: Verify none of those keys are public.，更多细节参见夫子
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下一代3系将推出M350 xDrive，取代现款M340i xDrive，同时还将新增i3 40 xDrive、i3 50 xDrive两款纯电车型。