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atomic number 69    我要挑错精准翻译

参考词典中atomic number 69的常规释义:

英英解释
  •  1个名词解释

    1. 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
      [同] atomic number 69, thulium, tm
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