| 释义 |
radio·met·ricBrE /ˌreɪdiəʊˈmetrɪk/ NAmE /ˌreɪdioʊˈmetrɪk/ adjective relating to a measurement of radioactivity 辐射度测量的▸ radio·met·ric·allyBrE /ˌreɪdiəʊˈmetrɪkli/ NAmE /ˌreɪdioʊˈmetrɪkli/ adverb ◆ These rocks have been dated radiometrically at two billion years old . 经辐射能探测，这些岩石形成于 20 亿年前。 |