Spontaneous SAH自发性蛛网膜下腔出血spontaneousadj.自发的，自然的，本能的；自然产生的spontaneous combustion area自燃火区spontaneous trait inference自发特质推理spontaneous magnetic domain自然磁畴Spontaneous breech delivery自然臀位分娩spontaneous thromboembolism自发性血栓栓塞spontaneous potential curve自然电位曲线spontaneously epileptic rat自发性癫痫大鼠spontaneous fire prevention自燃预防,自燃的预防spontaneous emission factor自然发射系数spontaneous fission process自发裂变过程