搭乘超音速飞机飞行会成为21世纪常见的旅行方式。
Supersonic flight could become a routine form of travel in the 21st century.
1947年，查克·耶格尔用火箭动力的X - 1第一次突破了音障，让我们吃惊的是，仅仅23年后，我们在休闲旅行中已经可以享受超音速飞行。
Chuck Yeager first broke the sound barrier in his rocket-powered X-1 in 1947, so it's staggering to think that just 23 years later, we stood poised to take our leisure travel supersonic as well.
对爆燃的主要特征之一，是火焰的速度大大低于音速的降低旅行。
One of the primary attributes of deflagration is that the flame travels at a speed significantly lower than the speed of sound.
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