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TOEFL BNC: 3892 COCA: 3652
radiation
/ˌreɪdiˈeɪʃn ||; ˌredɪˈeʃən/noun[U]
1 powerful and very dangerous rays that are sent out from certain substances. You cannot see or feel radiation but it can cause serious illness or death 辐射 ☞Look at radioactive. 参看radioactive
2 heat, light or energy that is sent out from sth 放热;发光;辐射能: ultraviolet radiation 紫外线辐射

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