spontaneousnessn.自发(自生；自然产生；自然；天然)spontaneousadj.自发的，自然的，本能的；自然产生的Spontaneous unassisted delivery无辅助的自然分娩Spontaneously igniting in air.自燃的在空气中自发地燃烧的spontaneous detachment of retina特发性视网膜脱离spontaneous autoimmune nephritis自发自身疫性肾炎spontaneous and self-conscious自发和自觉spontaneous communication system自愈通信系统spontaneous rupture of membranes自发性胞膜破裂spontaneous displacement of lens特发性晶状体移位Spontaneous monolayer dispersion自发单层分散spontaneous tension pneumothorax高压性自发性气胸