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大开口 : 20 phrases in 11 subjects |
| Aviation | 1 |
| Drilling | 4 |
| Economy | 1 |
| General | 1 |
| Nautical | 2 |
| Oil / petroleum | 1 |
| Plastic surgery | 1 |
| Solar power | 1 |
| Surgery | 1 |
| Technology | 3 |
| Textile industry | 4 |
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