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The algorithm walks the tree recursively. At each node, it checks: does this node's bounding box overlap with the query rectangle? If not, the entire subtree gets pruned (skipped). If it does overlap, it tests the node's points against the query and recurses into the children.，更多细节参见爱思助手下载最新版本
def save(self, item: Item) - None:，这一点在safew官方版本下载中也有详细论述
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