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radioactivity

英 [,reɪdɪəʊæk'tɪvɪtɪ] 美[,redɪoæk'tɪvəti]
  • n. 放射性;[核] 放射能力;[核] 放射现象

考试真题


Frederic became one of her assistants, and Irene taught him the techniques required to work with radioactivity.

2017年12月四级真题(第一套)听力 Section C