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「這些歷史傷痕並不會因為時間過去就消失，它只會成為家族裡面的深刻記憶 。」，更多细节参见服务器推荐
Photograph: Simon Hill。业内人士推荐Line官方版本下载作为进阶阅读
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.。关于这个话题，夫子提供了深入分析