声障[shēng zhàng]
{航空} sonic barrier; sound barrier
1. sound barrier：sound audition sensation 声音知觉 | sound barrier 声障 | sound board 声板
2. sonic barrier：sonic bang 声击 | sonic barrier 声障 | sound absorption 声吸收
3. sonicthreshold：sonicthermometer 声波温度计 | sonicthreshold 声障 | sonictransducer 声传感器