雌雄同体

The androgyne is the united male and female principles together.

雌（阴阳人）是男性与女性法则的联合。

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

涡虫是雌的，殖系统适于内受精。单源的吸虫（单殖纲）大多是鱼的虫。