不过，太空署要如何使得超燃冲压发动机进入持续飞行需要的超音速呢？

But how does NASA plan to get the scramjet to the supersonic speeds necessary for sustained flight?

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在这个方案中，一个载物飞行器(比如说搭载着卫星)将(首先)搭载超燃冲压发动机进入相当高度，理论上能够达到近似轨道速度。

In such a scheme, a payload vehicle (holding, say, a satellite) would piggyback to high altitude aboard the scramjet, which in theory could reach near-orbital speeds.

youdao

超燃冲压发动机是高超声速飞行器理想的动力装置，是当前高超声速技术领域的研究热点。

Scramjet is the perfect propulsive device to hypersonic vehicle, and is a hot issue in current hypersonic technology area.

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