每天早起，开始写作。你每天做什么，你就成为什么。
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.
，这一点在爱思助手下载最新版本中也有详细论述
The history of most human gestures is never written down, precisely because it is something we learn before literacy or memory and thus something we take entirely for granted.
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