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atomic number 72    我要挑错精准翻译

参考词典中atomic number 72的常规释义:

英英解释
  •  1个名词解释

    1. a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons
      [同] hafnium, hf, atomic number 72
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