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天电学 : 40 phrases in 10 subjects |
| Astronomy | 1 |
| Aviation | 2 |
| Communications | 1 |
| Earth sciences | 1 |
| Electronics | 5 |
| General | 3 |
| Space | 13 |
| Technology | 10 |
| Telecommunications | 2 |
| United States | 2 |
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