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| 焊接部位; 焊缝区 | |||
| 焊接区 | |||
| 焊接面; 焊接区分界面; 熔合面 | |||
| weld area: 8 phrases in 5 subjects |
| Chemistry | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 2 |
| Rail transport | 1 |
| Technology | 2 |
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