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BNC: 16448 COCA: 20084
radioactivity
noun [U] chemistry /ˌreɪdiəʊækˈtɪvəti/
  1. 1
    a form of energy that is produced by a radioactive substance and is harmful in large amounts 辐射;放射;辐射能
     Synonyms and related words
  2. 2
    the ability that some substances have to produce energy in the form of radiation 放射性
     Synonyms and related words

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