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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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This layered approach -- hardware for the fast path, microcode for the complex path -- is a recurring theme in the 386 design.
Mr Duffy called for proposals from commercial companies to build a reactor that could generate at least 100 kilowatts of power.
（四）强行冲闯公安机关设置的警戒带、警戒区或者检查点的。