所以，飞机必须保持一个最低速度以产生升力，而且飞行的高度越高，飞机维系升力的速度也越高。
A plane must maintain a minimum speed to generate lift, and the higher it travels, the faster it must go.
所以，飞机必须保持一个最低速度以产生升力，而且飞行的高度越高，飞机维系升力的速度也越高。
A plane must maintain a minimum speed to generate lift, and the higher it travels, the faster it must go.
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