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
同义词:radon, atomic number 86
a graduate nurse who has passed examinations for registration
同义词:registered nurse
详细解释:
RnNONE(无词性)The symbol for the element radon元素radon的符号