贫困是顽疾，“顽”在成因复杂、难以根除、极易反复。
The project started as a master's thesis (2008); see the thesis for details:，更多细节参见体育直播
，详情可参考91视频
Adding penalties or preferences for certain roads.。体育直播对此有专业解读
Graphics by Tommy Lumby, Amy Jackson and Phil Leake
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