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三区制
agric. three-crop rotation system; three field system; three-year field system
tech. three-field system
三区制轮作
agric. three-crop system; three-plot system
三区制指轮作
agric. three-course system
三区轮作
anim.husb. three-field system
三区[轮作]制
desert. three-field system
三区 制: 3 phrases in 2 subjects
General1
Soil science2