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| preparation of land | |||
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整理土地 : 24 phrases in 8 subjects |
| Agriculture | 2 |
| Desert science | 1 |
| Earth sciences | 6 |
| Ecology | 4 |
| Environment | 1 |
| Hydraulics | 1 |
| Hydroelectric power stations | 1 |
| Technology | 8 |
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