spontaneousadj.自发的，自然的，本能的；自然产生的spontaneous angina自发型心绞痛spontaneous speech自然语言spontaneous appeal自发的呼吁spontaneous action自发行动; 自发行为Spontaneous breach破裂出血spontaneous emitter自发发射体spontaneous request自发请求spontaneous folding自动折叠spontaneous writing自发性写作spontaneous changes自发变迁