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