（二）投放虚假的爆炸性、毒害性、放射性、腐蚀性物质或者传染病病原体等危险物质扰乱公共秩序的；
The algorithm maintains a running "best distance" that starts at infinity. As it walks the tree, it checks each visited point and updates the best distance if it finds something closer. Before recursing into a child node, it checks whether the closest possible point in that child's bounding box is farther than the current best. If so, the entire subtree gets pruned.，这一点在heLLoword翻译官方下载中也有详细论述
Extremely quick and efficient，这一点在im钱包官方下载中也有详细论述
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