单词 | atomic number 71 |
释义 | atomic number 71 (extremely rare) n WORD FAMILY atomic number 71 n a trivalent metallic element of the rare earth group; usually occurs in association with yttrium Syn|Hyper Lu, lutecium, lutetium 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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