| 单词 | atomic number 61 |
| 释义 | Atomic Number 61 nnoun.substancea soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium Synset:Pm promethium Hypernyms:metal metallic element Inherited Hypernyms:promethiummetallic elementchemical elementsubstancematterphysical entityentity Inherited Hypernyms:promethiummetallic elementchemical elementsubstancepartrelationabstractionentity |
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