（二）享有政治权利，人身自由未受到限制；
The tree is rebuilt every frame. For scenes of this scale, quadtree construction is fast enough to rebuild from scratch each frame, though larger simulations may benefit from incremental updates. Each particle queries its neighborhood for potential collisions, typically checking only 5 to 15 candidates instead of all 40. Red highlights indicate colliding pairs.
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# -- Finalize container setup --
昨晚，苹果 CEO Tim Cook 在社交媒体官宣：