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球 径 : 49 phrases in 11 subjects |
| Astronautics | 1 |
| Astronomy | 3 |
| Automobiles | 1 |
| Electronics | 1 |
| General | 19 |
| Mathematics | 3 |
| Military | 2 |
| Oil and gas | 1 |
| Silicate industry | 2 |
| Technology | 15 |
| United Nations | 1 |
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