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radon 'reidɒn

柯林斯1⭐

释义

n. 氡
[化] 氡Rn

英文释义

n. a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health

BNC词频排名: 17,806 | 当代语料库词频排名: 18,058