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| 分区中心 | |||
| section center: 18 phrases in 8 subjects |
| Automobiles | 4 |
| Aviation | 3 |
| Bridge construction | 1 |
| Earth sciences | 1 |
| General | 1 |
| Geophysics | 1 |
| Technology | 5 |
| Wind Energy | 2 |
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