The quadtree is the two-dimensional case of a broader family of space-partitioning data structures. Octrees extend the same idea to three dimensions (splitting cubes into eight children), KD-trees use alternating axis-aligned splits (splitting along x, then y, then x again), and R-trees group nearby objects into bounding rectangles. Each variant makes different tradeoffs between construction time, query speed, and update cost.
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持有、使用、生产、储存、运输和处置核材料的单位，应当依法取得核材料许可证。。谷歌浏览器【最新下载地址】对此有专业解读
Author(s): Junwei Che, Xuezhi Wang
He added that what happened at the Baftas had at least raised awareness, and made Tourette's "a very public subject in a very short space of time".