sporadic case

• 散发病例

sporadic case的用法和样例：

例句

1. Its prevalence and sporadic cases often happened in Asia-Pacific area.
   乙脑的流行和散发病例多发生在亚太地区。
2. Though polio has practically been wiped out, there have been sporadic cases of the disease.
   小儿麻痹症虽然实际上已被消灭，但一直有散发病例出现。