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子系原子 : 21 phrases in 10 subjects |
| Aviation | 3 |
| Chemistry | 1 |
| Earth sciences | 1 |
| Electronics | 4 |
| General | 2 |
| Metallurgy | 2 |
| Name of organization | 4 |
| Space | 2 |
| Technology | 1 |
| United States | 1 |
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