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| 81. | acoustic coupling |
| 声音耦合 |
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| 82. | To lower the level of(the voice. |
| 压低（声音） |
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| 83. | sound Bandwidth |
| 声音带宽 |
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| 84. | drop one's voice |
| 降低声音 |
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| 85. | sound clarity |
| 声音清晰度 |
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| 86. | fullness of sound |
| 声音丰满度 |
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| 87. | a loud voice |
| 声音宏亮 |
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| 88. | acoustic information |
| 声音信息 |
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| 89. | To use the voice. |
| 运用声音 |
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| 90. | digit-coded voice |
| 数字编码声音 |
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