1. They found many ways to improve the soil. 
   他们找到了很多改良土壤的办法。
2. Mr. Smith gave a lesson on how to improve soil. 
   史密斯先生讲了一堂如何改良土壤的课。
3. West Indian forage plant cultivated in southern United States as forage and to improve soil. 
   在美国南部栽培的一种西印度的饲料植物，也用于改善土壤质量。
4. soil and soil mass 
   土和土体
5. A mixture of decaying organic matter, as from leaves and manure, used to improve soil structure and provide nutrients. 
   堆肥腐烂有机体的混合物，如树叶或粪便，用来改善土壤结构并增加土壤养分

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• 1. 改良土壤耕性
  improve soil texture 改良土壤结构...improve soil tilth 改良土壤耕性...improve the quality of products 提高产品质量
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