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| 超声波存储器; 声音存储器; 声储存器 | |||
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| 声存储器 | |||
| 超声波存储器; 声音存储器; 声储存器 | |||
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acoustical storage : 4 phrases in 3 subjects |
| Shipbuilding | 1 |
| Space | 1 |
| Technology | 2 |
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