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固体发动机 : 88 phrases in 11 subjects |
| Astronautics | 1 |
| Automobiles | 1 |
| Aviation | 13 |
| Construction | 1 |
| Earth sciences | 1 |
| French | 1 |
| General | 3 |
| Space | 56 |
| Technology | 3 |
| Transport | 2 |
| United States | 6 |
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