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共同系统 : 17 phrases in 11 subjects |
| Air defense | 1 |
| Corporate governance | 3 |
| Electronics | 1 |
| Environment | 1 |
| Finances | 2 |
| Name of organization | 2 |
| Nautical | 1 |
| Project management | 1 |
| Space | 1 |
| Technology | 1 |
| United Nations | 3 |
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