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| твёрдый; непреклонный; жёсткий; чёрствый | |||
| 刚硬: 22 phrases in 9 subjects |
| Drilling | 1 |
| Electronics | 1 |
| General | 8 |
| Geology | 1 |
| Mathematics | 1 |
| Metallurgy | 2 |
| Military | 1 |
| Oil / petroleum | 1 |
| Technology | 6 |
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