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自由边界 : 12 phrases in 8 subjects |
| Communications | 1 |
| Earth sciences | 1 |
| Engineering geology | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Information technology | 1 |
| Nautical | 1 |
| Technology | 4 |
| Wind Energy | 2 |
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