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圆 轨道 : 87 phrases in 13 subjects |
| Agriculture | 1 |
| Air defense | 3 |
| Automobiles | 4 |
| Aviation | 5 |
| Chemistry | 1 |
| Earth sciences | 1 |
| Electronics | 3 |
| General | 4 |
| Life sciences | 1 |
| Space | 44 |
| Technology | 17 |
| United Nations | 2 |
| Wind Energy | 1 |
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