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| 旋转中心 | |||
| rotation center: 13 phrases in 8 subjects |
| Agriculture | 2 |
| Automobiles | 3 |
| Aviation | 1 |
| Bridge construction | 2 |
| Geophysics | 1 |
| Skydiving | 1 |
| Technology | 2 |
| Wind Energy | 1 |
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