| 单词 | atomic number 72 |
| 释义 | atomic number 72 (extremely rare) n WORD FAMILY atomic number 72 n a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons Syn|Hyper Hf, hafnium 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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