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| underlying stratum; underlying layer; sublayer subjacent bed | |||
| subjacent bed; subjacent layer; sublayer; underlayer | |||
| substratum; understratum; underlying bed | |||
| 下卧层: 29 phrases in 7 subjects |
| Bridge construction | 9 |
| Engineering geology | 4 |
| General | 1 |
| Hydroelectric power stations | 2 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Technology | 11 |
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