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| 下卧层; 下伏土层 | |||
| 下伏层 | |||
| 下伏地层 | |||
| 下臣卜土层; 下卧土层 | |||
| 下覆岩层; 下覆地层; 下覆层 | |||
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underlying stratum : 9 phrases in 3 subjects |
| Bridge construction | 3 |
| Engineering geology | 1 |
| Technology | 5 |
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