Lauder, who has tested out the jetpack twice, said when you're on the ground and preparing for takeoff, there's a lot of vibration and noise.

Lauder已经测试过这种飞行器两次了，认为当你在地上准备起飞时，飞行器会产生巨大的震动和声响。

youdao

A a vertical takeoff aircraft is one that can rise straight from the ground.

垂直起飞飞机是一种能竖直地离地升空的飞机。

youdao

Sixteen hours after takeoff, the Vimy's wheels touched ground.

起飞后十六个小时，“维米号”的双轮着陆了。

youdao

But at 95 degrees Fahrenheit and 5, 352 feet above sea level, with no takeoff flaps, we needed more ground speed.

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Traces on the ground show that the plane veered toward the left of the runway as it neared takeoff.

CNN: graphic

They can be productive enroute and hit the ground running, instead of scrambling to catch up with all the things they missed since takeoff.

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