With the development of aeronautic and astronautic engineering, the velocity and the height of the vehicle are ever increasing.
随着航空、航天工程的迅猛发展，飞行器的速度和高度不断增加。
With the development of aeronautic and astronautic engineering, the velocity and the height of the vehicle are ever increasing.
随着航空、航天工程的迅猛发展，飞行器的速度和高度不断增加。
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