the speed of sound
声音的速度；音速的；声速的；声的速度
双语例句
1.The aeroplane will travel at twice the speed of sound.x09
这架飞机的速度将是音速的两倍.
2.The new airplane flies at twice the speed of sound.x09
这架新式飞机以两倍于音速的速度飞行.
3.The aim is to fly at about Mach 2,twice the speed of sound.x09
目标是以大约2马赫的速度飞行,也就是音速的两倍.
来自柯林斯例句