The change in air pressure associated with a sonic boom is only a few pounds per square foot — about the same pressure change experienced riding an elevator down two or three floors.
和音爆有关的气压变化只有每平方英尺几磅——大约是坐电梯向下两到三层所感受到的气压变化。
The sharp release of pressure, after the buildup by the shock wave, is heard as the sonic boom.
冲击波累积之后压力的瞬间释放，就是人们听到的音爆。
It is the rate of change, the sudden onset of the pressure change, that makes the sonic boom audible.
是变化的速率和发生的突然性使得音爆可以被听见。
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