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1. Oxford Dictionary

   trim tab

   • n.
     an adjustable tab or aerofoil attached to a control surface, used to trim an aircraft in flight.；an adjustable flap fitted to the trailing edge of a rudder or keel, used to adjust steering, or fitted horizontally as one of a pair on the stern and used to trim a boat at speed.

   • noun: trim tab, plural noun: trim tabs

2. • 更多解釋

   trim tab

   • IPA[trim tab]

   • n.
     an adjustable tab or airfoil attached to a control surface, used to trim an aircraft in flight.

   Oxford American Dictionary