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 twice the speed of sound.
这架新飞机的飞行速度是音速的两倍。
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。
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。
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。
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。
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