poor rotation
可怜的旋转
以上为机器翻译结果，长、整句建议使用 人工翻译 。
He says the soil is worn out, partially due to poor crop rotation.
VOA: standard.2010.04.01
Shallow plowing, no crop rotation, inadequate seedbeds, and other habits sustained by lore and tradition resulted in poor production and soil exhaustion.
NEWYORKER: Testing, Testing
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