单词 | atomic number 43 |
释义 | atomic number 43 (extremely rare) n WORD FAMILY atomic number 43 n a crystalline metallic element not found in nature; occurs as one of the fission products of uranium Syn|Hyper Tc, technetium 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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