第十七条 国家加强原子能领域科学技术规划计划的衔接，完善科学技术资源、技术开发需求的交流机制，发挥市场配置资源的作用。
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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It said residents had difficulty obtaining insurance because of high costs, and there was a significant risk to health and danger to life in the area.