这架飞机有足球场那么长，有6辆双层巴士那么高，最多可以持续飞行长达5天。

The aircraft is massive—as long as a football field and as tall as 6 double decker buses and capable of continuous flying for up to 5 days.

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9小时的持续飞行是美洲狮标准电池工作时间的3倍。

The nine-hour flight duration more than triples the duration of Puma's standard battery-only operation.

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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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