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1. Oxford Dictionary

   ventral fin

   • n.
     another term for pelvic fin；an unpaired fin on the underside of certain fishes.

   • noun: ventral fin, plural noun: ventral fins

2. • 釋義

   n.

   名詞

   • 1. another term for pelvic fin
   • ▪ an unpaired fin on the underside of certain fishes.
   • 2. a single vertical fin under the fuselage or tail of an aircraft.