The aeroplane will travel at twice the speed of sound.
飞机将以两倍于音速的速度飞行。
The new airplane flies at twice the speed of sound.
这架新式飞机以两倍于音速的速度飞行。
Light travels faster than sound at the speed of 300,000 kilometres per second.
光速比声速要快，为每秒钟30万公里。
The jet can fly at twice the speed of sound.
这喷气式飞机能以两倍于音速的速度飞行。
Thee new airplane flies at twice the speed of sound.
这架新式飞机以两倍于音速的速度飞行。
Detonation is propagation of a combustion-driven shock wave at or above the speed of sound.
爆轰是一种以冲击波为特征，以超音速传播的爆炸。
The aim is to fly at about Mach 2, twice the speed of sound.
目标是以大约2马赫的速度飞行，也就是音速的两倍。
At near the speed of sound, we were flying ahead of our engine's roar.
由于速度几近音速，我们把引擎的轰鸣声甩在了后面。
At near the speed of sound, we were flying ahead of our engine's roar.
由于速度几近音速，我们把引擎的轰鸣声甩在了后面。
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