短语词组短语stalled airfoil 失速机翼airfoil blade 翼型叶片airfoil terminology 翼形术语tapered airfoil 渐缩翼形biconvex airfoil 双凸翼形multisurface airfoil 复式翼形supersonic airfoil [航]超音速翼型blade airfoil 叶型inflective airfoil 型面沿径向弯曲 返回 airfoil