| 释义 |
radio·met·ricBrE /ˌreɪdiəʊˈmetrɪk/NAmE /ˌreɪdioʊˈmetrɪk/ adjectiverelating to a measurement of radioactivity 辐射度测量的▸ radio·met·ric·ally BrE /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。 |