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限制 系统 : 37 phrases in 14 subjects |
| Agriculture | 7 |
| Air defense | 1 |
| Animal husbandry | 1 |
| Automobiles | 1 |
| Aviation | 5 |
| Biotechnology | 3 |
| Business | 2 |
| Chemistry | 1 |
| Electronics | 3 |
| Genetics | 3 |
| Space | 3 |
| Technology | 5 |
| Telecommunications | 1 |
| United States | 1 |
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