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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

    • 釋義

    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.