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研齿 : 22 phrases in 9 subjects |
| Automobiles | 3 |
| Construction | 2 |
| Dentistry | 3 |
| General | 2 |
| Metallurgy | 1 |
| Milk production | 1 |
| Oil / petroleum | 1 |
| Shipbuilding | 2 |
| Technology | 7 |
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