The spatial view (the grid of rectangles) and the tree view (the hierarchy of nodes) represent the same structure. Searching for a point means walking down the tree: at each node, you check which of the four children contains your target coordinate and recurse into that child. You never visit the other three.
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确实如此。春节期间，我说了太多“不”。一些需要走访远房亲戚的场合，我要么早退，要么干脆拒绝前往。理由很简单：人已经够多，多我一个不多。去了也不过是当个吉祥物，换个地方玩手机，反而让自己不痛快。。关于这个话题，快连下载安装提供了深入分析
A photographer has captured six planets in one picture as part of a celestial planetary parade.