But even if they make it to market soon, don't expect to be zipping around the country at the speed of sound.

即使这些飞机很快的投入市场，也不要期待以音速飞行的飞机可以在国家间呼啸而过。

youdao

And the reason we don't notice all this emptiness is because air molecules are constantly moving around at the speed of sound, and bouncing against any surface that happens to fall in their path.

我们没有注意到这一点的原因是空气分子以音速在不停地移动，而当它们碰到任何表面时都会反弹回去。

youdao

The aeroplane will travel at twice the speed of sound.

飞机将以两倍于音速的速度飞行。

《柯林斯英汉双解大词典》

"When flying low in combat, speed is life. Now,from the left,Captain Smith and Captain Cox return to show center at 300 feet and nearly the speed of sound,".

VOA: standard.2009.11.15

The reality is that business is expected to move nearly at the speed of sound to meet earnings expectations each quarter.

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Work at the speed of sound instead.

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These waves travel at the speed of sound, but when a jet travels at Mach 1 and above these waves merge into one single shock wave as they cannot get out of the way of each other quickly enough.

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