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石油砂 : 25 phrases in 11 subjects |
| Bridge construction | 1 |
| Chemistry | 1 |
| Commerce | 1 |
| Ecology | 1 |
| Economy | 6 |
| Geology | 1 |
| International trade | 3 |
| Oil / petroleum | 1 |
| Shipbuilding | 2 |
| Technology | 7 |
| Textile industry | 1 |
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