| 单词 | protoactinium |
| 释义 | protoactinium (once / 1313257 pages) n WORD FAMILY protoactinium n a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead Syn|Hyper Pa, atomic number 91, protactinium metal, metallic element any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. |
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