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单词 atomic number 91
释义
Atomic Number 91
nnoun.substancea short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
Synset:Pa protactinium protoactinium
Hypernyms:metal metallic element
Inherited Hypernyms:protactiniummetallic elementchemical elementsubstancematterphysical entityentity
Inherited Hypernyms:protactiniummetallic elementchemical elementsubstancepartrelationabstractionentity
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更新时间:2024/11/10 23:50:58