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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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此次枪击事件已造成包括1名作案嫌疑人在内的16人死亡、40人受伤。这是自1996年塔斯马尼亚州亚瑟港枪击事件造成35人死亡以来，澳大利亚发生的最严重的大规模枪击事件。。爱思助手下载最新版本对此有专业解读
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Matthew Smith said his life revolved around being tethered to oxygen tanks