radon gas

例句：

1. 1. Radongas is a radioactive gas that cancause lung cancer if inhaled.
   氡气是一种放射性气体，吸入后可能导致肺癌。
2. 2.The house was sealed off from the outsideworld due to high levels of radon gas.
   由于高浓度的氡气，这所房子与外界隔绝了。
3. 3. Radon gas testing is required for new homesto ensure they are safe for living.
   新房屋需要进行氡气检测以确保居住安全。