单词	R-value
释义	R-value noun ˈär-ˌval-(ˌ)yü  : a measure of resistance to the flow of heat through a given thickness of a material (such as insulation) with higher numbers indicating better insulating properties compare u-value Word History Etymology probably from thermal resistance First Known Use 1948, in the meaning defined above
随便看	preslices preslicing presoak presoaked presoaking presoaks presold presolved presolves presolving presoma presong presort presorted presorting presorts Prespa, Lake prespansko jezero prespecified prespecifies prespecify prespecifying presphygmic prespinous prespiracular

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