| 单词 | deuterium |
| 释义 | Word Frequency deuterium(djuːˈtɪərɪəm) noun a stable isotope of hydrogen, occurring in natural hydrogen (156 parts per million) and in heavy water: used as a tracer in chemistry and biology. Symbol:Dor2H; atomic no: 1; atomic wt: 2.014; boiling pt: –249.7°C Word origin C20: New Latin; see deutero-, -ium; from the fact that it is the second heaviest hydrogen isotope |
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