（应受访者要求，刘成、兰丽为化名）
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.
。关于这个话题，旺商聊官方下载提供了深入分析
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The leaked police log shows that, at 12:40, Peter 1 issued the order allowing the use of lethal fire.