| 单词 | atomic number 84 |
| 释义 | atomic number 84 (extremely rare) n WORD FAMILY atomic number 84 n a radioactive metallic element that is similar to tellurium and bismuth; occurs in uranium ores but can be produced by bombarding bismuth with neutrons in a nuclear reactor Syn|Hyper Po, polonium 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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