第一个（刺背鳍是在前面的黑。

The first dorsal fin is black at the front.

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鲨鱼的背鳍像刀样迅速划破水面。

The shark's fin sliced the water.

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鲨鱼的背鳍被渔夫割了下来。

The shark's dorsal fin was cut off by the fisherman.

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它的背鳍就在我的前面，我尖声呼救。

Its dorsal fin was in front of me. I was screaming for help.

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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 .

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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 .

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