飞行器在速度达到音速左右时,会有一股强大的阻力,使飞行器产生强烈的振荡,速度衰减。这一现象被俗称为音障。当飞行器突破这一障碍后,整个世界都安静了,一切声音全被抛在了身后!那个白的东西,就是在突破音障的一瞬间,由于空气气流的不均衡搅动产生的,一般情况下是看不到的,所以才珍贵。
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