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点轨迹 : 22 phrases in 9 subjects |
| Astronautics | 1 |
| Electronics | 1 |
| General | 2 |
| Mathematics | 2 |
| Military | 2 |
| Missiles | 2 |
| Oceanography & oceanology | 1 |
| Technology | 10 |
| Water supply | 1 |
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