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半球头 : 22 phrases in 10 subjects |
| Architecture | 1 |
| Aviation | 1 |
| Chemistry | 1 |
| Drilling | 1 |
| Electronics | 2 |
| Engineering geology | 1 |
| Nautical | 1 |
| Oil / petroleum | 2 |
| Space | 1 |
| Technology | 11 |
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