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改进 型 系统 : 35 phrases in 9 subjects |
| Air defense | 1 |
| Aviation | 5 |
| Earth sciences | 2 |
| Electronics | 15 |
| Space | 7 |
| Technology | 1 |
| Telecommunications | 2 |
| United States | 1 |
| Water resources | 1 |
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