spo·rad·ic /spəˈrædɪk/
 (a.)偶爾發生的,零星發生的,分散的
 spo·rad·ic /spəˈrædɪk/ 形容詞
 散髮的,散在的,單個發生的
 Spo·rad·ic a.  Occurring singly, or apart from other things of the same kind, or in scattered instances; separate; single; as, a sporadic fireball; a sporadic case of disease; a sporadic example of a flower.
 Sporadic disease Med., a disease which occurs in single and scattered cases. See the Note under Endemic, a.
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 sporadic
      adj : recurring in scattered and irregular or unpredictable
            instances; "a city subjected to sporadic bombing raids"
            [ant: continual]