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Real game engines use this pattern (or its 3D cousin, the Octree) for broad-phase collision detection: the quadtree quickly identifies candidate pairs, and a more expensive narrow-phase check tests the actual geometry.
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牛犇進一步稱，張又俠倒台令人驚訝之處在於，習近平在剷除政治腐敗團夥時，會放過圈內的高級保護人。張又俠明年二十一大後便要退休，讓他悄然退場本是輕而易舉。但習近平選擇不這樣做。
The x86 protection model is notoriously complex, with four privilege rings, segmentation, paging, call gates, task switches, and virtual 8086 mode. What's interesting from a hardware perspective is how the 386 manages this complexity on a 275,000-transistor budget. The 386 employs a variety of techniques to implement protection: a dedicated PLA for protection checking, a hardware state machine for page table walks, segment and paging caches, and microcode for everything else.