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| ободок; кольцо, обрамляющее отверстие | |||
| кольцеобразный паз | |||
| кольцевое пространство | |||
| 孔环: 37 phrases in 9 subjects |
| Agriculture | 1 |
| Astronomy | 2 |
| Drilling | 1 |
| General | 14 |
| Information technology | 1 |
| Medical | 1 |
| Oil / petroleum | 2 |
| Oil processing plants | 1 |
| Technology | 14 |
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