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| non-cultivation layer; soil pan; subhorizon; subsoil (subsoleum); subsoil horizon; subsoil layer | |||
| subsurface layer | |||
| subsurface horizon; plough pan; tillage pan; plough sole | |||
| 心土层: 9 phrases in 3 subjects |
| Agriculture | 6 |
| Desert science | 2 |
| Technology | 1 |
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