当需求不稳定、价格下探、技术迭代叠加在一起时，这门生意的风险结构就变得复杂。
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.。safew官方下载对此有专业解读
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