| 单词 | rubidiums |
| 释义 | rubidium /roo-bidˈi-əm/nounA soft silvery-white metallic element (symbol Rb; atomic no 37) ORIGIN: L rubidus red (so called from two red lines in its spectrum) rubidˈium-stronˈtium dating noun A method of determining the age of rocks that are more than 10 million years old by measuring the relative amounts of rubidium-87 and its beta decay product strontium-87 |
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