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.
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（七）利用职务上的便利收受他人财物或者谋取其他利益的；
"Research has shown that chalk stream salmon are genetically unique and irreplaceable. They play a vital role in the ecosystem, supporting insects, birds, mammals, and other river life," the trust said.