The aim is to fly at about Mach 2, twice the speed of sound.

目标是以大约2马赫的速度飞行，也就是音速的两倍。

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The Concorde's delta wing made the plane's sustained cruising speed of Mach 2 possible.

协和飞机的三角翼飞机作出的持续巡航速度2马赫的可能。

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HTV-2, an unmanned hypersonic aircraft designed to travel at Mach 20, failed during a test flight last month.

HTV - 2，一架巡航速度设计为20马赫的无人超音速飞机，于上月试飞失败。

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A.L.L.S. flew all the way from Switzerland to launch a 10-foot, carbon-fiber beauty designed to go Mach 2.5.

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By contrast, a jet fighter plane travels at speeds of Mach 1 to Mach 2, and the Space Shuttle blasts into space at Mach 25.

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At altitude, its top speed is Mach 2.25 compared to Mach 2 for the U.S. F-16 Fighting Falcon, another multirole fighter aircraft made by General Dynamics and Lockheed Martin.

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