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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.，这一点在爱思助手下载最新版本中也有详细论述
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Responding to the offer, BMA resident doctors committee chairman Dr Jack Fletcher said "it does nothing to restore pay for doctors, which remains well within the government's power".，详情可参考WPS官方版本下载
The island will add 0.55 hectares (1.4 acres) of new habitat - almost the size of a football pitch - within the Blackwater Estuary once the work is complete.
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