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| крепкий; прочный; надёжный; твёрдый | |||
| 直固: 33 phrases in 9 subjects |
| Aviation | 2 |
| Drilling | 1 |
| Electronics | 2 |
| General | 12 |
| Mathematics | 1 |
| Medical | 1 |
| Nautical | 3 |
| Rail transport | 1 |
| Technology | 10 |
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