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
中文释义
n. 氡 [化] 氡Rn
详细用法及例句
1.
It's been shut down for years, but the building has never been leased since because of a radon leak underground.
