巴爾金強調，柏林無法忽視眼前德國面對的來自北京的挑戰——從貿易失衡開始，以及中國將稀土作為武器、北京對俄羅斯的支持，並在其區域間展現更強硬的姿態，尤其是對日本和台灣等。
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.
，更多细节参见91视频
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