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氡 (氡) dōng
  • General meaning
  • Definitions
◎ 一种气体元素,有放射性,无色无臭,不易跟其他元素化合。医药上用来治疗癌症。
Noun
  1. 由镭蜕变生成的惰性气体族的一种重放射性气体元素,在医学中的应用类似于镭 [radium]——元素符号Rn

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