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 emission coefficient自发发射系数,自发射系数spontaneous brainstem hemorrhage特发性脑干出血spontaneous ignition temperature自燃温度,自燃着火点spontaneous combustion coal seam自燃煤层spontaneous rupture of esophagus自发性食管破裂spontaneously ruptured membranes自发性胞膜破裂Spontaneous and in public sphere自发支援型公共性spontaneous vestibular nystagmus自发性前庭性眼球震颤Spontaneous dislocation of joint关节自发性脱位spontaneous hemorrhagic necrosis自发性出血性坏死