0 a chemical element that is a radioactive gas formed when radium decays and found naturally in rock and soil -- radônio, rádon
Tests showed high radon levels.
中文繁体
氡（鐳衰變時形成的一種氣體放射性元素，在大自然中存在於岩石和土壤中）…
中文简体
氡（镭衰减时形成的一种放射性元素，发现自然存在于岩石和土壤中）…
Polski
radon…
NOVAS PALAVRAS
European
May 10, 2021
PALAVRA DO DIA
Shimmer
radon
