旋翼桨叶弯曲扭转振动不稳定性的英文

pitch-lag instability

• 旋:    whirl
• 翼:    the wing of a bird
• 桨叶:    awe; paddle
• 弯曲:    winding; meanderin ...
• 扭转:    turn round; turn a ...
• 振动:    vibrate; vibration ...
• 不:    a block of wood