基本解释自發蛻變；自發衰變词组短语短語spontaneous radioactive disintegration 自然放射蛻變spontaneous E disintegration 自發衰變spontaneous ŵ disintegration 自發衰變spontaneous multilevel disintegration 解躰堦段disintegration spontaneous 自發蛻變专业释义物理學自發蛻變