- audio frequency spectrum
- audio spectrum
- 声频: audio frequency; sonic frequ ...
- 谱: table; chart; register
- 白噪声频谱: white noise spectrum
- 超声频谱: supersonic spectrum; ultrasonic ectroscopy; ultrasonic ectrum; ultrasonic spectroscopy; ultrasonic spectrum
- 超声频谱学: ultrasonic spectroscopy
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