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BNC: 17806 COCA: 18058

radon

Related topics: Elements
ra·don /ˈreɪdɒn $ -dɑːn/ noun [uncountableU]  
HCEa radioactive gas that is used in the treatment of diseases such as cancer. It is a chemical element: symbol Rn 氡〔一种化学元素,符号为Rn
Examples from the Corpus
Origin radon
(1900-2000) radium
ra·don noun
Chinese
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