flukes

Schistosomiasis (or bilharziasis)：Group of chronic disorders caused by parasitic flatworms of the genus Schistosoma (blood flukes).

血吸虫病:由血吸虫属寄生扁虫引起慢性疾病。

Ever wonder if that whiskery fellow walking his jowly Scottish terrier or that leggy, long-haired blonde jogging with her Afghan hound were just flukes?

你有否觉得，那个长着山羊胡伙遛着他那只皱皮疙瘩苏格兰梗，或者那个长腿长发美女跟她阿富汗猎犬一起慢跑时候，他们简直就是一对？

4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.

涡虫是雌雄同体，生殖系统适于体内受精。单起源吸虫（单殖纲）大多是鱼外寄生虫。