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。
亚纲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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