4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.
涡虫是雌雄同体的，
统适于体内受精。单起
的吸虫（单纲）大多是
的外寄虫。
4 Turbellarians are monoecious with the reproductive systems adapted for internal fertilization. And the monogenetic flukes (class Monogenea) are mostly ectoparasites of fishes.
涡虫是雌雄同体的，统适于体内受精。单起的吸虫（单纲）大多是的外寄虫。
声明：以上例句、词性分类均由互联
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