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系统小组 : 25 phrases in 11 subjects |
| Air defense | 1 |
| Aviation | 2 |
| Business | 1 |
| Corporate governance | 1 |
| Earth sciences | 4 |
| Economy | 1 |
| Electronics | 2 |
| General | 2 |
| Name of organization | 9 |
| Space | 1 |
| United Nations | 1 |
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