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长途交换 : 41 phrases in 11 subjects |
| Agriculture | 1 |
| Communications | 1 |
| Electronics | 15 |
| Exhibitions | 1 |
| General | 1 |
| Information technology | 3 |
| Rail transport | 2 |
| Shipbuilding | 1 |
| Space | 1 |
| Technology | 10 |
| Telecommunications | 5 |
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