（四）核反应堆，是指为了利用核反应产生的能量、中子、核素等建设的装置。
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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The segmentation unit performs two operations simultaneously: adding the segment base to produce the linear address and comparing the effective address against the segment limit. Both use dedicated 32-bit adder/subtractor circuits.