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 vertex delivery顶先露自然分娩, 自动顶部分娩Spontaneous heating balance自热平衡spontaneous crystallization自发结晶spontaneous-potential log自然电位测井Spontaneous breathing trial自主呼吸试验spontaneous combustion fire自燃发火spontaneous nuclear fission自发核分裂spontaneous hypertesion rat自发性高血压大鼠spontaneous short-circuit自然短路spontaneous combustion coal自燃煤