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套管 塞 : 15 phrases in 8 subjects |
| Automobiles | 1 |
| Drilling | 1 |
| Electric machinery | 1 |
| Engineering geology | 1 |
| Nautical | 1 |
| Oil / petroleum | 4 |
| Otorhinolaryngology | 1 |
| Technology | 5 |
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