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| Chinese | English |
| 亚音频的 | infrasonic |
| 测渣音频警报 | audio alarm for slag detection (器: The BOF operators will observe a sharp change of the tap stream in color on a video monitor and will hear an audio alarm for slag detection when slag is detected at tap. 出钢作业时一旦检测到炉渣，氧气顶吹转炉操作人员即能在视频监控器上观察到出钢钢流颜色发生明显变化，并能听到测渣音频警报。) |
| 特超声速的超音频的马赫数大于5 | hypersonic |
| 超音频 | supersonic frequency |