| 单词 | atomic number 81 |
| 释义 | atomic number 81 (extremely rare) n WORD FAMILY atomic number 81 n a soft grey malleable metallic element that resembles tin but discolors on exposure to air; it is highly toxic and is used in rodent and insect poisons; occurs in zinc blende and some iron ores Syn|Hyper Tl, thallium 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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