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| 催还: 50 phrases in 13 subjects |
| Agriculture | 1 |
| Automobiles | 21 |
| Business | 1 |
| Chemistry | 2 |
| General | 1 |
| Metallurgy | 4 |
| Nautical | 3 |
| Oil / petroleum | 5 |
| Oil processing plants | 2 |
| Polymers | 1 |
| Securities | 1 |
| Technology | 7 |
| Water resources | 1 |
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