She is not usually good at table tennis; that winning stroke was a fluke.

"她平时乒乓球打得并不好,那取胜的一击抽球不过是侥幸而已。"

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

涡是雌雄同体的，生殖系体内受精。起源的吸（殖纲）大多是鱼的外寄生。

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?

有否觉得，那个长着山羊胡子的家伙遛着他那只皱皮疙瘩的苏格兰梗，或者那个长腿的金色长发美女跟她的阿富汗猎犬一起慢跑的时候，他们简直就是一对？