VTOL aircraft is an under - actuated system with three degrees of freedom and two control inputs.

VTOL空间飞行器是具有三个自由度,两个控制输入的欠驱动系统.

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Apollo Fighter - $ 1000 - This VTOL aircraft uses its dual machine guns to take out aircraft.

阿波罗战斗机 —— 1000:这个垂直起降飞行器使用双机枪来对付空军.

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