中国的濒危语言对语言史、语言谱系分类以及民族历史文化都有其独特的研究价值。
They also have their unique research value to language history, genealogical classification, ethnic history and culture.
研究者把一个分类到另一分类的严重症状进行了补充，从而形成一个有效的双重精神障碍的疾病谱系，研究者并对此进行了特别说明。
The observation of increasing symptom severity from one category to the next reinforces "the validity of the spectrum concept of bipolarity, " the researchers note.
根据全网各站点各季节的典型行业用电负荷构成比例，运用谱系数平均距离聚类分析法，对全网各季节的负荷站点做出合理的分类。
According to the proportion of load composition, using the hierarchical cluster analysis based on average distance, the substations can be classified reasonably.
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