基本解释[鱼] 臀鳍词组短语短语anal fin rays 臀鳍Anal fin ray 臀鳍条vent to anal fin length 排泄孔臀鳍长anal fin更多词组英英字典柯林斯英英字典 a median ventral unpaired fin, situated between the anus and the tail fin in fishes, that helps to maintain stable equilibrium anal fin剑桥字典anal fin柯林斯字典专业释义农业科学臀鳍生物学臀鳍