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| seatearth | |||
| under clay | |||
| underclay | |||
| coal clay; coal sear; dunstone; root clay; seat clay (层); seat earth; thill; underclay (层); underearth | |||
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底黏土 : 15 phrases in 5 subjects |
| Agriculture | 2 |
| Engineering geology | 3 |
| General | 2 |
| Hydroelectric power stations | 2 |
| Technology | 6 |
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