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第二十九条 国家支持核反应堆在动力、供热、海水淡化、制氢、同位素生产以及科研等方面的应用。

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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Founded by brothers Ralph and Albert Slazenger in 1881, the brand became a go-to for golf and tennis equipment and was appointed the official ball supplier for Wimbledon in 1902.

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