1·America's forthcoming "Prompt Global Strike" non-nuclear hypersonic missiles will be able to hit almost any spot on earth in less than an hour-provided excellent satellite data is available.
美国即将问世的“全球快速打击”非核高超音速导弹，能在一小时内，打击地球上几乎任何地点——前提条件是有尖端卫星数据可用。
2·We know how to insert the aircraft into atmospheric hypersonic flight.
我们知道如何让飞机进入大气层并以高超音速飞行。
3·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.
并且高超音速飞机目前只演示过由其他飞行器携带小型无人机至高速，而且其他计划中的试验飞行器同样太小不能坐人。
4·The Falcon Hypersonic Test Vehicle 2 (HTV-2) successfully separated from its rocket but lost contact shortly into its "glide phase".
“猎鹰”高超音速试验机(HTV - 2)成功与运载火箭分离，然而进入“滑翔阶段”后不久便与地面失去了联系。
5·It is necessary to simulate the high enthalpy, high pressure, Mach number and the same concentration of oxygen species as air in hypersonic flight.
地面实验设备必须要模拟高超音速飞行状态下气流的焓、压力、M数和空气中氧气的组分。