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"pinned": false,
，更多细节参见51吃瓜
An aerial shot shows two of the barges being moved into position
Bren Pierce with Kinisi's KR1 robot, fitted with pincers and suction cups
There's a tradeoff: a lower capacity means you can skip more space during queries (you zoom in faster), but the tree has more nodes and uses more memory. A higher capacity means fewer nodes but each node requires checking more points linearly. As a starting point, capacities between 4 and 16 are reasonable defaults, though the best value depends on your data distribution and query patterns.