| 单词 | atomic number 69 |
| 释义 | Atomic Number 69 nnoun.substancea soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime Synset:Tm thulium Substance Holonyms:apatite monazite xenotime Hypernyms:metal metallic element Inherited Hypernyms:thuliummetallic elementchemical elementsubstancematterphysical entityentity Inherited Hypernyms:thuliummetallic elementchemical elementsubstancepartrelationabstractionentity |
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