1. A rotation of personnel; crop rotation. 
   员工的轮流替换；农作物的轮作
2. The same crop ought not be grown in the same place every year; 
   每年不能都在同一地区种植同样的农作物，最好进行轮作。
3. The government is helping farmers change their traditional cultivation habits of letting land lie idle after harvest — a centuries-old practice known as “white fallow,” which is detrimental to water and soil conservation. Rotation of grain and grass is adopted to increase the fertility of the soil and its ability to conserve water. 
   政府帮助农民改变千百年来传统的撂荒式的“白色休耕”等不利于保持水土的耕种习惯，实行粮草轮作等生物手段，提高土壤的肥力和水分涵养能力。
4. Most farmers alternate crops. 
   多数农民实行轮种。
5. Rape and barley are grown is rotation here. 
   这里油菜和大麦轮种。

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• 1. crop rotation
  crop failure 作物失收；作物减产...crop rotation 轮植；轮作；轮耕...cropping pattern 作物生产型式
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• 2. rotation
  44 rotate [r?u'teit] v.(使)旋转...45 rotation [r?u'tei??n] n.轮作；旋转...46 routine [ru:'ti:n] a.常规的，例行的
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• 3. rotation of crops
  rotation irrigation 轮灌...rotation of crops 轮作...rotation pasture 轮牧
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• 4. rotate v. plant different crops each year; take turns in regular order
  restrict v. keep within limits 限制；限定；约束...rotate v. plant different crops each year; take turns in regular order 轮作...substantial a. noticeable; important 显著的；重大的
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