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| усилитель звука; мегафон; рупор | |||
| звуковой усилитель; звукоусилитель | |||
| усилитель звуковой частоты | |||
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扩音机 : 6 phrases in 3 subjects |
| Aviation | 1 |
| General | 2 |
| Technology | 3 |
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