| 单词 | atomic number 69 |
| 释义 | atomic number 69 (extremely rare) n WORD FAMILY atomic number 69 n a soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime Syn|Hyper Tm, thulium 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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