It was a bittersweet end to nearly 28 years of commercial supersonic travel.
对于营运了将近28年的超音速商业航行来讲，这是一个苦乐参半的结局。
Breaking the sound barrier generates a sonic boom, so supersonic travel is heavily restricted over land.
打破音障时会产生音爆，所以超音速飞行在陆地上空有诸多限制。
Supersonic flight could become a routine form of travel in the 21st century.
搭乘超音速飞机飞行会成为21世纪常见的旅行方式。
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.
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。
These planes travel at supersonic speeds.
这些飞机以超音速的速度飞行。
These planes travel at supersonic speeds.
这些飞机以超音速的速度飞行。
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