| 单词 | atomic number 39 |
| 释义 | atomic number 39 (extremely rare) n WORD FAMILY atomic number 39 n a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys Syn|Hyper Y, yttrium 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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