随后贝尔实验室的科学家们制造出的一个版本采用过氧化氢，并能提供数秒的空中时间。

Then scientists at Bell Labs produced a version that ran on hydrogen peroxide and provided a few seconds of lift.

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随着时间的推移，羽毛变得越来越大，扑翼飞行逐渐发展，鸟类最终完全可以在空中飞行。

As feathers became larger over time, flapping flight evolved and birds finally became fully air-borne.

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一些宇宙飞船在太空中停留一段时间后可能会出现问题。

Some spacecraft may have problems while in space after a certain amount of time.

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It goes up, stays in the air for a very long time, but it falls on your head.

它先上升 在空中停留很长时间,但是它会直接落在头上

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You see how long you are in the air and the whole time you are in the air, you are traveling horizontally at this speed.

你可以知道在空中停留的时间,当你在空中运动的时候,你一直以这个水平速度在运动

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That's how long you are in the air.

那就是在空中停留的时间

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