radioactive/͵redIoˋæktIv; ˌreIdiəʊˈæktIv◄/adj a radioactive substance sends out RADIATION (=a form of energy that can harm or kill people) 具有放射性的: radioactive waste 放射性废料 —radioactivity /͵redIoækˋtIvətI; ˌreIdiəʊækˈtIvəti or ˌreIdiəʊækˈtIvIti/n [U] high levels of radioactivity 高强度的放射性