“要想一想这里是国内生产总值重要还是绿水青山重要？作为水源涵养地，承担着生态功能最大化的任务，而不是自己决定建个工厂、开个矿，搞点国内生产总值自己过日子。”2019年一次座谈会上，习近平总书记谈及保护“中华水塔”三江源的重要性。
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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.