Now, going through the sound barrier.

现在，穿过音障。

This is a depiction of supersonic jets breaking the sound barrier.

这是一幅超音速喷气式飞机冲破音障的描绘。

In just seconds, the jet smashes through the sound barrier.

仅仅用了几秒，飞机就突破了音障。

In 1947, X-1 became the first manned aircraft to break the sound barrier.

1947年，X-1飞机成为第一架突破音障的载人飞机。

The engineers back at base feared that breaching the sound barrier might rip the aircraft apart.

回到基地的工程师们担心，打破声屏障可能会把飞机撕成碎片。

Air temperature changes this, but the sound barrier can typically be broken at around 760 miles per hour.

温度对声速会有影响，但音障通常会在每小时760英里左右被打破。

It was built in the 1950s, when breaking the sound barrier was at the very limit of our technical abilities.

它建造于 1950 年，在当时音障的难关挑战着科学技术的极限。

Air temperature affects the precise mark, but the sound barrier can typically be broken at around 760 miles per hour.

空气温度会影响精确的时标，但每小时 760 英里左右的速度通常可以打破音障。

So, OK, there's a sound barrier right there - hard to hear.

所以，好吧，那里有一个音障——很难听到。

It is the same principle as when fighter jets break the sound barrier.

这与战斗机突破音障时的原理是一样的。