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| 81. | sonic depth finder |
| 音响测深仪 |
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| 82. | polarized sounder |
| 极化音响机 |
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| 83. | Audible pedestrian signa |
| 盲人音响号志 |
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| 84. | acoustic signal device |
| 音响信号装置 |
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| 85. | sound locating instrument |
| 音响寻踪仪 |
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| 86. | voice rotating beaco |
| 音响旋转信标 |
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| 87. | audible warning |
| 音响警告声 |
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| 88. | Sight and Sound |
| 画面与音响 |
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| 89. | acoustic phobia |
| 恐音响症 |
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| 90. | acousticfog signa |
| 音响雾号 |
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