The sound is obviously propagating at the speed of sound, right?

声音显然是以音速传播的，对吧？

UBS, a bank, thinks supersonic travel has a future.

瑞银认为超音速旅行的前景一。

And my Supersonics coaches George Karl and Tim Gergich, thank you very much.

还有我在超音速效力时的乔治·卡尔教练和蒂姆·格里奇教练，非常感谢你们。

It's very expensive to fly faster than the speed of sound.

飞行速度超过音速是非常昂贵的。

Next, we're looking at how NASA is aiming to take commercial travel to supersonic speeds.

接下来，让我们了解一下美国国家航空航天局是如致力于将商业旅行速度提升到超音速的吧。

While not constant, the speed of sound is typically how fast?

虽然音速不是恒定的，但通常有多快？

Supersonic describes speeds that are greater than the speed of sound.

超音速描述了于音速的速度。

Things like inflatable drag devices, that we could inflate at the speed of sound.

比如可在音速速度下充气的减速装置。

Glenn is already a public figure, after making the first cross-country supersonic flight.

Glenn 早已是一个公众人物，因为他是进行超音速越国界飞行的第一人。

The only civilian jet to ferry passengers faster than the speed of sound was the Concorde.

唯一能以超过音速的速度运送乘客的民用飞机是协和式飞机。

I want to get to the point where a supersonic ticket is actually cheaper than subsonic.

我想让超音速的票比亚音速的票价便宜一点。

The launch of the hypersonic missile was North Korea's third round of missile tests this month.

高超音速导弹的发射是朝鲜本月进行的第三轮导弹试射。

WASP-127b, which is about 520 light-years away, has supersonic jet-stream winds unlike any we've seen before.

这颗名为“WASP-127b”的行星距球约 520 光年，拥有超音速的高速喷流风，而这是我们前所未见的。

That happened in December 1953, after a few flights approaching Mach 2, twice the speed of sound.

这发生在1953年12月，几次飞行接近2马赫，是音速的两倍。

It has plans to develop a passenger airplane that can travel faster than the speed of sound.

这家公司计划发一种比音速更快的客机。

She added that the decision to make hypersonic weapons creates an imbalance that the department must deal with.

她补充说，研制高超音速导弹的决定会导致不平衡局面，这是美国国防部必须要予以处理的。

The modern airliners fly 85% the speed of sound, they've got Spitfires flying at 96,97% the speed of sound.

现代飞机的速度是音速的85%，而“喷火”的速度是音速的96%-97%。

China is also investing in new technologies, including weapons that would fly at five times the speed of sound.

中国还投资了新的科学技术，包括速度可达5倍音速的武器。

Spike, another American firm with supersonic ambitions, is developing an 18-seat business jet that doesn't make a loud boom.

另一家有超音速野心的美国公司Spike正在发一种18座的低音爆公务机。

So first off, Mach 6.7 means that's 6.7 times the speed of sound.

首先，6.7 马赫意味着音速的 6.7 倍。