With the helicopter moving backwards at medium pace, the helicopter will be aileron-rolled twice, each roll being clearly delineated by 4 hesitation points.
直升机中速后退飞行的过程中做两个四位横滚，横滚的四个停顿点要清楚。
With the helicopter moving backwards at medium pace, the helicopter will be aileron-rolled twice, each roll being clearly delineated by 4 hesitation points.
直升机中速后退飞行的过程中做两个四位横滚，横滚的四个停顿点要清楚。
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