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| 专有线路 | |||
| 私人線路 (An additional phone number with a distinct ring tone that cannot be forwarded. A private line allows a person who delegates calls to have a direct, confidential line) | |||
| 专用线 | |||
| 专线 | |||
| 专用记录道; 专用信道 | |||
| 专用铁路线; 民营铁路 | |||
| 用户专线 | |||
| 专用线路 | |||
| private line: 46 phrases in 10 subjects |
| Aviation | 1 |
| Communications | 2 |
| Electronics | 22 |
| Finances | 1 |
| Information technology | 5 |
| International trade | 1 |
| Metallurgy | 1 |
| Space | 1 |
| Technology | 8 |
| Telecommunications | 4 |
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