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Từ điển Oxford Advanced Learner 8th
radioactivity
radio·activ·ity BrE [ˌreɪdiəʊækˈtɪvəti] ; NAmE [ˌreɪdioʊækˈtɪvəti] noun uncountable
•the study of radioactivity
•a rise in the level of radioactivity
Main entry: ↑radioactivederived
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