The aeroplane will travel at twice the speed of sound.
飞机将以两倍于音速的速度飞行。
Sound is a form of wave energy that can travel through air.
声音其实就是声波，能在空气中行进的声波。
All airplanes will travel faster than the speed of sound.
所有飞机的速度都会超过声音的速度。
All airplanes will travel faster than the speed of sound.
所有飞机的速度都会超过声音的速度。
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