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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（一）境外单位或者个人向境内单位或者个人销售服务、无形资产，在境外现场消费的服务除外；
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Buying a camera for travel photography, sports photos or vlogging is a bit trickier. Here, you need to choose either a compact camera with a fixed lens or a mirrorless model that supports removable lenses.