| 单词 | atomic number 77 |
| 释义 | atomic number 77 (extremely rare) n WORD FAMILY atomic number 77 n a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium Syn|Hyper Ir, iridium 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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