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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儘管裁決對他不利，特朗普堅持關稅「將以經充分批准與測試的替代法律地位維持」，並暗示這些稅收「終有一天將完全取代所得稅」。當他首次強調「關稅」一詞時，現場出現明顯沉默；隨後他宣稱關稅「運作良好」時，周圍傳來低語與騷動。他補充說：「連民主黨人都知道這一點。」