1. contour economically or efficiently. 
   描画出经济的或者高效率的轮廓。
2. Cultivation of land; tillage. 
   耕作，耕种开垦土地；耕作
3. The cultivation of soil; tillage. 
   土地的耕作；耕种
4. tillage machine with power-driven working parts 
   驱动型土壤耕作机械
5. Annie: How much you have tillage, and how much you will gain harvest. 
   安妮：真是“一分耕耘，一分收获”啊！

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• 1. 等高耕作
  contour strip cro ing 等高带状种植...contour tillage 等高耕作...contour value 等高线数值
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