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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.
，这一点在safew官方下载中也有详细论述
其实目前AI面对的问题和10年前手机市场遇到的一样。高端不走量，低端没利润。
几天后，类似的情节再次上演。她收到了一条“顺丰快递”的短信，说她的包裹已滞留，让她回拨一个号码处理。她照做了，电话那头又变成了另一个“客服”。这一次，我在旁边听得真切，立刻上前打断，对着话筒严厉呵斥。对方故技重施，瞬间挂断。
Most ergonomic keyboards fall into two categories: fully split which separates the board into two pieces, and unibody split, also known as an Alice design, which angles the keys outward at the bottom. When the keys are rotated outward or split into two halves, it allows for a wider spread between your elbows for a more relaxed typing position. Other ergonomic features, such as thumb clusters, center tenting and negative tilting are sometimes added to either type of board.