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参考物 : 27 phrases in 15 subjects |
| Aviation | 3 |
| Biotechnology | 1 |
| Chemistry | 1 |
| Fishery fishing industry | 2 |
| General | 1 |
| Geophysics | 1 |
| Librarianship | 3 |
| Metallurgy | 1 |
| Space | 1 |
| Statistics | 2 |
| Technology | 3 |
| Telecommunications | 2 |
| United States | 1 |
| Video recording | 1 |
| Water resources | 4 |
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