The first dorsal fin is black at the front.
第一个（刺背鳍是在前面的黑。
The shark's dorsal fin was cut off by the fisherman.
鲨鱼的背鳍被渔夫割了下来。
Its dorsal fin was in front of me. I was screaming for help.
它的背鳍就在我的前面，我尖声呼救。
His dorsal fin was down and his huge pectorals were spread wide.
它的脊鳍朝下耷拉着，巨大的胸鳍大张着。
We know this because we can distinguish the male by their large dorsal fin .
我们能知道是因为可由大背鳍区别为雄性。
We know this because we can distinguish the male by their large dorsal fin .
我们能知道是因为可由大背鳍区别为雄性。
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