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	postrecord postreduction postremogeniture postresurrection postresurrections postretirement postrevolutionary postrider postriders postriot postromantic postrorse posts posts up postscapula postscapular postsceniums postscore postscript postscripta postscripts postscriptum postscutellar postscutellum postscutum

英语词典包含469781条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。