| 单词 | atomic number 57 |
| 释义 | atomic number 57 (extremely rare) n WORD FAMILY atomic number 57 n a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth Syn|Hyper La, lanthanum 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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