the sound barrier

剑桥词典

a large increase in the force opposing a moving object as its speed reaches the speed at which sound travels
声障，音障（指飞行物的速度达到音速时所产生的气动阻力急剧增大）
There is usually a sonic boom when an aircraft breaks the sound barrier . 飞机冲破声障时，通常会产生音爆。 返回 the sound barrier