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。
HTV-2, an unmanned hypersonic aircraft designed to travel at Mach 20, failed during a test flight last month.
歼22的特点是低看得见，高机动性机身；先进的综合航空电子系统；与动力表现让超音速巡航无加力。
The F-22 is characterized by a low-observable, highly maneuverable airframe; advanced integrated avionics; and aerodynamic performance allowing supersonic cruise without afterburner.
JSF打算打造有超音速巡航能力的隐形战斗机，使它成为解决海陆空各种冲突的可靠力量。
The JSF was intended to be a stealth fighter with the ability to cruise at supersonic speeds. It was intended to be reliable enough for different missions in land, sea and air conflict.
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