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1. Oxford American Dictionary

   dorsal fin

   • IPA[ˈdôrsəl fin]

   • n.
     an unpaired fin on the back of a fish or whale, e.g. the tall triangular fin of a shark or killer whale.

   • noun: dorsal fin, plural noun: dorsal fins

2. • 更多解釋

   dorsal fin

   • n.
     an unpaired fin on the back of a fish or whale, e.g. the tall triangular fin of a shark or ...

   Oxford Dictionary