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| 抛物面反射器式传声器; 抛物面反射传声器; 抛物面传声器 | |||
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| 抛物面反射器式传声器; 抛物面反射传声器; 抛物面传声器 | |||
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parabolic microphone : 2 phrases in 1 subject |
| Technology | 2 |
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