999英语网 英语单词
Radon的音标发音
Radon
英式发音：['redn] or ['redɑn]
美式发音
(noun.) 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.
奥古斯都手打
