spontaneousadj.自发的，自然的，本能的；自然产生的Spontaneous fistula自发瘘spontaneous azotemia自发性氮质血症spontaneous hatching自发酸化spontaneous bunching自发群聚spontaneous creaming自然膏化spontaneous mutation自发突变,自然突变spontaneous emulsion自发乳状液,稳定乳状液spontaneous emission自发发射spontaneous feelings自发的感情spontaneous activity自发性活动