剑桥词典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 放射线；辐射线；辐射能 A dangerous amount of radioactivity was released into the environment last month . 上个月泄漏了大量的放射线，造成很大危险。 返回 radioactivity