有关四腮目头足类的，以两对腮为特征，并包括有腔鹦鹉螺和许多化石的种类。
Of, relating to, or being a cephalopod of the order Tetrabranchiata, characterized by two pairs of gills and including the chambered nautilus and many fossil species.
座头鲸不像齿鲸亚目鲸或齿鲸，它们是须鲸亚目、无害的大海兽，嘴里只有须鲸板。
Unlike orca, which are odontocetes or toothed whales, humpbacks are mysticetes, harmless leviathans with only baleen plates in their mouths.
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