sporadicadj.不定时发生的；零星的sporadicalalnessn.发生sporadic clashes零星冲突sporadic showers阵雨sporadic numbers零星卷期sporadic choleran.假霍乱；类似霍乱的疾病sporadic e layer分散E层,分散 e 层sporadic synonyms偶发性同义词语Sporadic disorder散发病症sporadic mutation自然突变sporadic outbreak散发性猖獗