control surface

名词 control surface:

1. a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight
   同义词：airfoil, aerofoil, surface

1. A variable control surface on the trailing edge of an aircraft wing, used primarily to increase lift or drag.
   襟翼飞机后翼上最初用来增加上升力或拖力的可灵活控制的辅助翼