spontaneous law自发法spontaneousadj.自发的，自然的，本能的；自然产生的spontaneous electric field自然电场spontaneous ission neutron自发裂变中子Spontaneous abortion early早期流产spontaneous fission source自发裂变源spontaneously hypertension自发性高血压Spontaneous magnetic field自生磁场spontaneous motor activity自发性运动:神经原活性spontaneous depolarization自动除极化Spontaneous pneumatothorax自发性气胸spontaneous whisker growth自发的须状晶体生长