spontaneouslyadv.自发地；自生地；自然产生地spontaneousadj.自发的，自然的，本能的；自然产生的spontaneous fracture自发性骨折spontaneous explosion自然爆炸spontaneous discourse即时言谈, 自然言谈spontaneous pulsation自发搏动spontaneous annealing自热退火spontaneous lactation乳汁自涌spontaneous hardening自然硬化spontaneous brainwave自发性脑电波Spontaneous abortions习惯性流产spontaneous remission自然康复