Perhaps that’s the biggest irony of all. Space is huge and mostly empty—and yet there’s no easy way to throw things out.
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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历史上，在北齐奠基人高欢的带领下，他的家族和部众从敕勒川辗转回到中原腹地。湾漳壁画墓中出土了6件大型鞍马、14件小马和4件驮马，其中驮马主要作为畜力使用，小马应是未成年马驹或备用之马的体现。
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