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自动数字跟踪 : 24 phrases in 10 subjects |
| Air defense | 2 |
| Aviation | 2 |
| Earth sciences | 1 |
| Electronics | 4 |
| Mathematics | 1 |
| Missiles | 1 |
| Space | 6 |
| Technology | 5 |
| Telecommunications | 1 |
| United States | 1 |
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