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1·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》

2·The new airplane flies twice the speed of sound.

这架新飞机的飞行速度是音速的两倍。

3·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。《新英汉大辞典》

4·How can we calculate the speed of sound?

我们怎样计算声音的速度？

5·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。

6·The speed of sound also depends on Young's modulus.

声速也同样，取决于杨氏模量。

7·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。

8·When did the first measurement of the speed of sound take?

第一次测量声速是在什么时候？

9·Scramjets engines can not start until the plane flies faster than the speed of sound.

超高速冲压喷气发动机引擎在飞机超过音速的情况下不能启动。

10·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。