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| отверстие грота; люк | |||
| портал; проём | |||
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洞口 : 35 phrases in 8 subjects |
| Aluminium industry | 1 |
| Construction | 4 |
| Electronics | 3 |
| General | 15 |
| Hydraulic engineering | 1 |
| Military | 1 |
| Technology | 9 |
| Water supply | 1 |
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