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海上井 : 81 phrases in 11 subjects |
| Bridge construction | 1 |
| Drilling | 7 |
| Ecology | 4 |
| Economy | 1 |
| Engineering geology | 1 |
| General | 1 |
| International trade | 1 |
| Metallurgy | 1 |
| Navigation | 3 |
| Oil / petroleum | 15 |
| Technology | 46 |
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