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| foundation slab | |||
| apron; river bottom protection | |||
| bottom protection; bottom stabilization; bottom stabilizing; river bottom protection (河流) | |||
| 护底: 60 phrases in 11 subjects |
| Architecture | 1 |
| Automobiles | 11 |
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| Basketball | 1 |
| Drilling | 1 |
| Engineering geology | 1 |
| Hydroelectric power stations | 7 |
| Metallurgy | 4 |
| Navigation | 1 |
| Nursing | 1 |
| Technology | 30 |
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