本底辐射 běndǐfúshè background radiation Definitions Defs Origin Strokes Stroke Words Sentences Sents 本底辐射 本底輻射 běndǐfúshè background radiation radiation from natural and artificial sources that is always present in the environment
本底辐射 本底輻射 běndǐfúshè background radiation radiation from natural and artificial sources that is always present in the environment
