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| porthole; wall hole | |||
| 墙孔: 67 phrases in 8 subjects |
| Architecture | 4 |
| Construction | 1 |
| Electronics | 2 |
| Engineering geology | 3 |
| General | 1 |
| Plastics | 3 |
| Shipbuilding | 3 |
| Technology | 50 |
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