sporadicadj.不定时发生的；零星的sporadic E propagation分散E层传播sporadic rectal cancer散发性直肠癌sporadic X-ray source暂现X射线源sporadic endemic goiter散发性地方性甲状腺肿Sporadic blood pressure偶测血压sporadic bovine leukosis牛散发性造白细胞组织增生sporadic spinning defect分散纱疵sporadic task scheduling零星事件调度sporadic parthenogenesis偶发性孤雌生殖Sporadic colorectal cancer散发性大肠癌