它的脊鳍朝下耷拉着，巨大的胸鳍大张着。
His dorsal fin was down and his huge pectorals were spread wide.
一种产于北美的小型淡水鱼（鰤鲈） ，长有带斑点的刺状脊鳍。
A small North American freshwater fish (Stizostidion canadense) having a spotted, spiny dorsal fin.
它闻到了这新鲜的血腥气，此刻正加快了速度，蓝色的脊鳍划破了水面。
Now he speeded up as he smelled the fresher scent and his blue dorsal fin cut the water.
它闻到了这新鲜的血腥气，此刻正加快了速度，蓝色的脊鳍划破了水面。
Now he speeded up as he smelled the fresher scent and his blue dorsal fin cut the water.
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