英语词汇“natural radioactivity background”的中英文释义、用法、翻译及短语词组-英汉翻译词典-东流网

单词	natural radioactivity background
释义	natural radioactivity background 英?[?n?t??r?l ?re?di:???k?t?v?ti: ?b?kɡraund] 美?[?n?t??r?l ?redio?k?t?v?ti ?b?k?ɡra?nd] 释义天然放射性本底
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