The algorithm maintains a running "best distance" that starts at infinity. As it walks the tree, it checks each visited point and updates the best distance if it finds something closer. Before recursing into a child node, it checks whether the closest possible point in that child's bounding box is farther than the current best. If so, the entire subtree gets pruned.
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In 1986, the Challenger spacecraft suffered a catastrophic failure seconds after launching, killing all seven crew members on board.。safew官方版本下载对此有专业解读
"We will have the Earth out the window as a single ball, something none of us have seen in that perspective.