The aircraft rose with unnatural speed on takeoff.
飞机以异常之速起飞升空。
The passengers are not aware of this speed at all during takeoff or landing.
在其起飞或着陆的时候，里面的乘客并没有意识到这个速度。
The takeoff is in essence an action that creates vertical speed.
踏跳动作的实质是创造垂直速度的过程。
The takeoff is in essence an action that creates vertical speed.
踏跳动作的实质是创造垂直速度的过程。
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