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A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.
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The cutest Pokémon in the bunch, this 587-piece Lego set builds out to an adorable 7.5-inch tall Eevee. With a movable tail, head, and limbs, builders can pose the fan-favorite in two ways: at rest or ready to jump into action. The most modestly priced of the sets, it retails for $59.99 and is officially live at Lego.com.
第八十八条 违反关于社会生活噪声污染防治的法律法规规定，产生社会生活噪声，经基层群众性自治组织、业主委员会、物业服务人、有关部门依法劝阻、调解和处理未能制止，继续干扰他人正常生活、工作和学习的，处五日以下拘留或者一千元以下罚款；情节严重的，处五日以上十日以下拘留，可以并处一千元以下罚款。
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Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.