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| solid formation | |||
| hard formation | |||
| hard layer; hard subsoil | |||
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硬 地层 : 29 phrases in 6 subjects |
| Desert science | 1 |
| Drilling | 8 |
| Geology | 1 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 7 |
| Technology | 11 |
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