个人飞行的梦想在许多发明家的脑海中仍然鲜活生动，一些人开发循环动力飞行器，另一些人则往喷气背包上大量投入资金。

The dream of personalised flight is still vivid in the minds of many inventors, some developing cycle-powered craft, others pouring money into jetpacks.

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换句话说：太空署梦想着设计大型轨道炮来将超高速太空飞行器以盲速发射至大气层。

Put another way: NASA is dreaming up massive railguns to launch hypersonic space vehicles into the atmosphere at blinding speeds.

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