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But with her job as commander, she had to pick up the mantle - she was to be in charge of the shuttle's following flight.
，更多细节参见爱思助手下载最新版本
FT Digital Edition: our digitised print edition。业内人士推荐谷歌浏览器【最新下载地址】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.