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| 汽车拉力赛内部通信系统 | |||
| 内线电话系统 | |||
| 对讲系统; 内部通信联络系统 | |||
| 船内通信设备 | |||
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| 内部对讲电话通信系统 | |||
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| 对讲系统 | |||
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intercom system : 4 phrases in 4 subjects |
| Aviation | 1 |
| Economy | 1 |
| Space | 1 |
| Technology | 1 |
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