spontaneousadj.自发的，自然的，本能的；自然产生的spontaneous noise自发噪声spontaneous event自发性事件spontaneous decay自发衰减spontaneous order自生自发秩序spontaneous labour自然分娩spontaneous murmur自发性杂音spontaneous agency无因管理spontaneous orders自发秩序spontaneous humour自然而优雅的幽默spontaneous origin自然发生