The first dorsal fin is black at the front.

第一个（刺背鳍是在前面的黑。

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Its sail-like first dorsal fin provides stability while swimming.

帆状的第一背鳍在游动时提供了稳定性。

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Its sail-like first dorsal fin provides stability while swimming.

帆状的第一背鳍在游动时提供了稳定性。

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