贫困是顽疾，“顽”在成因复杂、难以根除、极易反复。
nascent stages, MasterCard's predecessor pops up in 1966 to compete with Bank of
，详情可参考WPS官方版本下载
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// console.log(spanner.next(70)); // 输出2（正确）。关于这个话题，safew官方下载提供了深入分析