单词	free functor
释义	free functor 自由函子
随便看	underrelaxation method underscore understandability understandable understanding undetermined undetermined coefficient undetermined coefficients method undetermined multipliers undeterminedness undetermined number undirected undirected edge undirected graph undirected loop undirected network undirected path undisturbed undisturbed differential equation undor undotted index undotted spinor undulating number undulation unduloid

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