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| 81. | tional echo sounding |
| 定向回声测深 |
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| 82. | ultrasonic echo method |
| 超声波回声法 |
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| 83. | ultrasonic echo sounder |
| 超声回波测深仪 |
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| 84. | echo depth sounder |
| 回声测深仪;回音测深仪 |
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| 85. | inverted echo sounder |
| 反向回声测深仪 |
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| 86. | weak echo region |
| 弱回波区 |
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| 87. | navigation echo sounder |
| 导航回声测深仪 |
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| 88. | tunable echo box |
| 可调回波谐振器 |
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| 89. | radio echo observation |
| 无线电回波观测 |
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| 90. | echo meter=echometer |
| 回声测试器回声测深仪 |
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