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改进 系统 : 76 phrases in 14 subjects |
| Air defense | 2 |
| Aviation | 21 |
| Business | 2 |
| Chemistry | 1 |
| Earth sciences | 2 |
| Electronics | 21 |
| Information technology | 2 |
| Metallurgy | 1 |
| Securities | 2 |
| Space | 16 |
| Technology | 2 |
| Telecommunications | 2 |
| United States | 1 |
| Water resources | 1 |
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