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.
三年研发之路，资金问题始终是悬在头顶的利剑。即便如此，波波不想找外部投资，也不愿预支发行的预付款，她始终觉得“拿人手短，会失去创作的自由”。
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出道时，她110磅（约50公斤），二十几年下来，她重了几十磅，她说全败在喝酒上。
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Start school later, sleep longer, learn better: New study shows that flexible school start times can be an effective and practical approach to reducing chronic sleep deprivation and improving adolescents’ mental health and academic performance.
Что думаешь? Оцени!。关于这个话题，WPS官方版本下载提供了深入分析