劍橋詞典the quality that some atoms have of producing a type of energy that can be very harmful to health 放射（性） the energy produced by atoms in this way 放射線；輻射線；輻射能 A dangerous amount of radioactivity was released into the environment last month . 上個(gè)月泄漏了大量的放射線，造成很大危險(xiǎn)。 返回 radioactivity