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51. | in perfect and moving harmony. |
| 音调和谐动听。 |
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52. | orotund tones. |
| 洪亮的音调 |
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53. | a high [low] pitch |
| 高[低]音调 |
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54. | the swell of the tone |
| 音调的提高 |
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55. | tone control transformator |
| 音调控制变压器 |
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56. | tone adjustment |
| 色调[音调]调整 |
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57. | pitch of complex tone |
| 复合音的音调 |
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58. | Automatic Tone Correction |
| 自动音调调整 |
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59. | pitch trim compensator |
| 音调调整补偿器 |
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60. | correction for tonality |
| 音调修正系数 |
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