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1. Oxford Dictionary

   tail fin

   • n.
     a fin at the posterior extremity of a fish's body, typically continuous with the tail.；a projecting vertical surface on the tail of an aircraft, providing stability and typically housing the rudder.

   • noun: tail fin, plural noun: tail fins

2. • 釋義

   n.

   名詞

   • 1. a fin at the posterior extremity of a fish's body, typically continuous with the tail.
   • 2. a projecting vertical surface on the tail of an aircraft, providing stability and typically housing the rudder.
   • 3. an upswept projection on each rear corner of a car, popular in the 1950s.