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套管 环 : 46 phrases in 10 subjects |
| Compressors | 2 |
| Construction | 1 |
| Drilling | 14 |
| Earth sciences | 1 |
| Electric machinery | 1 |
| Electronics | 2 |
| Mining | 2 |
| Oil / petroleum | 13 |
| Otorhinolaryngology | 1 |
| Technology | 9 |
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