贫困是顽疾，“顽”在成因复杂、难以根除、极易反复。
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习近平总书记强调，“以钉钉子精神抓工作落实”“以创造性工作把党中央决策部署落到实处”“追求实实在在、没有水分的增长”……
Developers using the streams API are expected to remember to use options like highWaterMark when creating their sources, transforms, and writable destinations but often they either forget or simply choose to ignore it.