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教育中心 : 33 phrases in 11 subjects |
| Aviation | 4 |
| Business | 1 |
| Earth sciences | 2 |
| Ecology | 2 |
| Electronics | 8 |
| General | 1 |
| Librarianship | 3 |
| Name of organization | 3 |
| Space | 2 |
| Technology | 6 |
| United States | 1 |
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