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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.，详情可参考搜狗输入法下载
2月25日中午，国务院总理李强在北京人民大会堂同来华进行正式访问的德国总理默茨举行会谈。