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文件 事件 : 24 phrases in 11 subjects |
| Aviation | 1 |
| Business | 2 |
| Earth sciences | 1 |
| Economy | 2 |
| Electronics | 4 |
| Information technology | 3 |
| Name of organization | 1 |
| Nautical | 1 |
| Securities | 1 |
| Technology | 5 |
| Telecommunications | 3 |
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