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| 双向无线电话 | |||
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| 双向无线电通信 | |||
| 双向无线电台; 收发报机; 双向无线电通信 | |||
| 收发两用无线电设备 | |||
| 交直流两用无线电设备; 无线电对话机; 双向无线电设备 | |||
| two-way radios: 8 phrases in 4 subjects |
| Air defense | 1 |
| Oil / petroleum | 1 |
| Space | 3 |
| Technology | 3 |
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