It achieves hypersonicspeed using a special sort of engine known as a scramjet.
它通过一种叫做超音速燃烧冲压式喷气发动机的特殊发动机来实现超音速。
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In recent years, the most of new fighters and strategic missiles require fly with supersonic or hypersonicspeed, and this make a lot of researchers think much of this kinds of phenomena.
Plus, hypersonic flight has so far only been demonstrated for small unpiloted craft carried to high speed by other vehicles - and other planned experimental craft are too small to carry a pilot.