当然，它也面临一些挑战：亚利桑那州整体医疗人才短缺，预计到2030年，还需要额外1941名初级护理医生；而且医院高度依赖Medicare，报销率低，也会影响对人才的吸引力。但总体来说，Sun City的吸引力，已经远超亚利桑那州的农村地区，属于中等偏上水平。
You look at a region of the image. If all the pixels are roughly the same color (below some threshold), you store the average color for the whole region as a single value. If the pixels vary too much, you split the region into four quadrants and try again.，更多细节参见爱思助手下载最新版本
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.。服务器推荐是该领域的重要参考
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