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.
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Looking forward, Hartwig hopes his own two children will go on to continue the family enterprise.，详情可参考heLLoword翻译官方下载