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| trunk line service | |||
| long distance service | |||
| toll service | |||
| teletraffic | |||
| trunk service | |||
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长途 业务 : 15 phrases in 9 subjects |
| Aviation | 1 |
| Business | 2 |
| Communications | 1 |
| Electronics | 1 |
| Information technology | 4 |
| Rail transport | 1 |
| Space | 1 |
| Technology | 1 |
| Telecommunications | 3 |
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