radioactive substance的用法和樣例：
例句
- The radioactive substance can kill the nervous cells in the brain.
這種放射性物質(zhì)會(huì )殺死大腦的神經(jīng)細胞。 - Because of this radiation they said the substance was radioactive.
由于這種輻射性現象，他們把該種物質(zhì)稱(chēng)為放射性物質(zhì)。 - In the deep mantle the highest possible concentration of radioactive materials is limited by the condition demanding temperatures below the melting point.
在地幔深部，放射物質(zhì)最高的可能濃度受溶點(diǎn)以下的溫度條件所限制。
