natural radioactive gas的意思|示意

Radon is a natural radioactive gas that emanates from the ground into the air.

氡是一种放射性的自然气体，从地下散发到空气中。

Radon is a natural radioactive gas that occurs at higher than normal levels in certain parts of the U.S..

氡是一种天然的放射性气体，在美国某些地区浓度高于平均水平。

For most people more than half of their natural background radiation dose comes from radon, a radioactive gas that can accumulate in homes, schools and workplaces.

对大多数人来说，他们自然环境辐射剂量的一半以上来自氡—一种可聚集在家庭、学校和工作场所的放射性气体。