同义词： ventral fin
以上来源于: WordNet
N either of a pair of fins attached to the pelvic girdle of fishes that help to control the direction of movement during locomotion 腹鳍
Elongate fishes with pelvic fins and girdle absent or reduced.
长鱼，没有骨盆鳍和带状物，或已经退化。
Elongated mostly scaleless marine fishes with large pectoral fins and reduced pelvic fins.
多数细长的无鳞海水鱼，有大的胸鳍和退化的腹鳍。
Most species are small bottom dwellers with a weak suction cup formed by the fusion of their pelvic fins.
大部分为底栖鱼，特征是具一个由腹鳍愈合而成的吸力不强的吸盘。
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