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转 回系统 : 17 phrases in 9 subjects |
| Automobiles | 1 |
| Aviation | 1 |
| Chemistry | 1 |
| Earth sciences | 1 |
| General | 1 |
| Metallurgy | 9 |
| Nautical | 1 |
| Refrigeration | 1 |
| Technology | 1 |
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