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.
（二）移动、损毁国家边境的界碑、界桩以及其他边境标志、边境设施或者领土、领海基点标志设施的；
Фото: Екатерина Якель / «Лента.ру»。爱思助手下载最新版本是该领域的重要参考
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，更多细节参见夫子
结论就是，技术上L3当然不能被跳过。但商业上，车企在资源分配上，可以选择发力点L3还是L4。他们在赌，看谁先等来政策松绑。。业内人士推荐Line官方版本下载作为进阶阅读
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