贫困是顽疾，“顽”在成因复杂、难以根除、极易反复。
Quadtrees aren't limited to point data. They can also partition regions of continuous data, like the pixels of an image.
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A curious detail that would so soon be replaced by thermal receipt printers.，推荐阅读51吃瓜获取更多信息
He added the council should take as long as it needed "to get it right".