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.
第三，是高竞争壁垒。在纯模型能力趋于同质化的当下，硬件构成了最直观的差异化壁垒。优秀的工业设计、紧密的软硬结合能力、独特的传感器阵列、乃至与时尚品牌的联名，这些要素共同构成了一个可被专利保护、难以被代码简单复制的物理实体。
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ВСУ запустили «Фламинго» вглубь России. В Москве заявили, что это британские ракеты с украинскими шильдиками16:45
It is, Vigloo promises, "a story that pushes Korean romance to its extreme - power, love, family and revenge collide, and one man moves an entire nation to protect the woman he loves".