贫困是顽疾，“顽”在成因复杂、难以根除、极易反复。
Екатерина Щербакова (ночной линейный редактор)，更多细节参见WPS官方版本下载
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Councillor David Merrett, chair of the Arlingham Parish Council and dairy farmer, said: "When we first had the email about it, I thought it was a joke."。关于这个话题，safew官方下载提供了深入分析
Explicit backpressure