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至于美以现有反导系统，也处于“紧平衡”状态，数量最多的爱国者和铁穹备弹只够全面抗击首轮来袭导弹，高空拦截的THAAD和箭2/箭3也只够打四轮。不但备弹量不足，价格也非常高。铁穹拦截弹单价10万—15万美元，大卫投石索拦截弹单价70万美元，爱国者PAC-3为500万美元，THAAD为1260万美元，相对便宜的标准SM-3 Block1B是1250万美元， Block2A则高达2800万美元，箭2为350万美元，箭3有200万—400万美元多种说法。，这一点在夫子中也有详细论述
When another data point is inserted and the Voronoi diagram reconstructed, the newly created region displaces the area that once belonged to the old regions. Those points whose regions were displaced are considered natural neighbours to the new point. The weight of each natural neighbour is given by the area taken from the total area occupied by the new region. In 3D, we measure polyhedral volumes instead of areas.