the increase in aerodynamic drag as an airplane approaches the speed of sound
例句
用作名词 (n.)
Only this military aircraft is able to break the sound barrier. 只有这架军用飞机能够突破声障。
An added voltage is necessary to overcome the barrier thus created. 必须增加一个附加电压去克服这样引起的位垒。
She raised between them a barrier impenetrable as a wall. 她就在他们之间垒起一道不能越过的界线，象一堵墙一般。
Another flight of jets exploded through sound. 又一队喷气机雷鸣般地突破了音障。
If one feels those around him have become too noisy, a sound block device can be activated and soundproofing will immediately go into effect. 如今只要是公共场所，都设有声音调控器，如果嫌别人太吵，开启音障设备即可隔音。
美
