travelling, or designed to travel, more than five times faster than the speed of sound

NASA successfully completed its first hypersonic flight since the 1960s.

Hypersonic missiles cut down the time from identifying the target and then hitting it to just few minutes. 超高音速导弹将从识别目标到击中目标的时间缩短到几分钟。

The Air Force is developing a hypersonic engine designed to fly at Mach 6.5 speed, or more than 4,000 miles per hour.