A quadtree reduces this: rebuild the tree each frame, and for each object, query only the nearby region. Objects in distant quadrants are never compared.
報告形容中國「網路特別行動」是一項「資源充足、精心策劃，針對國內外對手的秘密作戰策略」。
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记者看到，在一片对比试验田里，中国杂交水稻植株挺拔，穗大粒多。“看，这就是技术的力量。”达博蹲在田埂上，轻轻托起一株杂交稻穗：“中国专家教会我们如何科学浸种、催芽，如何控制移栽的密度，就像给水稻安排了舒适的家，让它们能充分吸收阳光和养分。”他介绍，如今当地每公顷水稻产量达到10.8吨，比当地水稻品种的产量高出2至3倍。
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