我们不仅提出一种演进理论的实证性解释，也提出规范性解释。
We draw out the normative as well as the positive implications of an evolutionary theory.
计算结果表明，枯水流量演进模型是可行的，是对流量演进理论的有益尝试和补充；
The results show that water flow simulation and optimization models are better than others.
马克思关于社会经济形态演进理论的深层结构，是黑格尔“历史与逻辑统一”的思想。
The deep structure of Marxs theory on the evolution of social-economic formation is Hegel s idea of "the unification of history and logic".
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