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51. | loud and clear sound |
| 声音响亮 |
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52. | To use the voice. |
| 运用声音 |
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53. | fullness of sound |
| 声音丰满度 |
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54. | sound corrector |
| 声音校正器 |
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55. | acoustic coupling |
| 声音耦合 |
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56. | digit-coded voice |
| 数字编码声音 |
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57. | acoustic information |
| 声音信息 |
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58. | leakage of sound |
| 声音泄漏 |
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59. | drop one's voice |
| 降低声音 |
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60. | sound recording |
| 声音记录 |
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