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| 21. | tonal characteristic |
| 音调特性 |
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| 22. | tone distortion |
| 音调失真 |
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| 23. | volume control switch |
| 音调开关 |
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| 24. | exclamatory pitch |
| 感叹音调 |
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| 25. | Jinling sound |
| 铿锵音调 |
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| 26. | subaudible tone |
| 亚音频音调 |
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| 27. | lower pitch limit |
| 音调下限 |
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| 28. | constancy of pitch |
| 音调稳定性 |
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| 29. | standard musical pitch |
| 标准音调 |
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| 30. | frequency-modulated audio tone |
| 调频音调 |
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