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干硬性土 : 37 phrases in 9 subjects |
| Architecture | 6 |
| Bridge construction | 4 |
| Business | 1 |
| Earth sciences | 1 |
| Electronics | 1 |
| Engineering geology | 3 |
| Hydroelectric power stations | 2 |
| Metallurgy | 3 |
| Technology | 16 |
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