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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不过，有些时候，适度超前的想象力，会与既有法律法规、监管制度等产生冲突。如何处理好这类复杂的情况？不是一味否定，而是以包容审慎的态度看待新事物、新业态，如此，创新才有试错空间。，这一点在heLLoword翻译官方下载中也有详细论述
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