1. Landfill gas and liquid leach ate, which are the products of natural decay of organic wastes, are continuously released and cause considerable impact on the environment. 
   有机废物自然分解时不断释出沼气及产生渗滤污水，对环境造成严重影响。
2. non-crystalline material,amorphous material, glassy material 
   非晶态材料
3. mechanics of material，strength of material 
   材料力学
4. ageing of insulating material 
   绝缘材料老化
5. agricultural material handling machine 
   农用装卸输送机械

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• 1. 沥滤
  leach v. to separate (sth) from a material by passing water through the material 沥滤
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