翼剖面；机翼；翼面一个部件或平面，如机翼、螺旋桨叶、方向舵等，其形状或方位控制稳定性、方向、抬升、冲击或驱动

A part or surface, such as a wing, propeller blade, or rudder, whose shape and orientation control stability, direction, lift, thrust, or propulsion.