声垒

例句：

1. 1. The sound barrier is a significant factor in the speed of sound.
   声障是声音速度的一个重要因素。
2. 2. The sound barrier was designed to prevent aircraft from flying over populated areas.
   声障设计用来防止飞机飞越人口密集区。
3. 3. The sound barrier has been used to improve communication between different countries.
   声障被用来改善不同国家之间的通信。