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》

The hyena's whoop vocalization is a series of discrete calls produced in about of sound that can travel distances of more than two miles.

鬣狗“呜呜”叫声是由一轮发音而形成的一系列不连贯的呼唤，可以传播到两英里以外。

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The researchers also charted sound waves passing through nine quiet regions of the sun, where no sunspots were developing, and found no significant anomalies in the waves' travel time.

在无黑子活动的九个太阳宁静区，研究人员发现声波的传播时间没有这么大的变化。

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NASA, America's space agency, is paying for an experimental version of Inductrack that will travel at half the speed of sound.

ECONOMIST: Maglev trains

Because of the distance that low-frequency sound waves can travel under water, a set of four ships emitting sound at 235 decibels could monitor 80% of the world's oceans for submarines.

ECONOMIST: The American navy may soon have a whale of a problem

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.

CNN: Bang goes the sonic boom