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| reference sphere | |||
| 参 考球: 46 phrases in 9 subjects |
| Agriculture | 1 |
| Aviation | 6 |
| Earth sciences | 12 |
| Electronics | 1 |
| Librarianship | 1 |
| Oil / petroleum | 1 |
| Space | 11 |
| Technology | 11 |
| United Nations | 2 |
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