1. A degradation product of penicillin, C5H11NO2S, that is used as a chelating agent and in the treatment of rheumatoid arthritis and copper poisoning. 
   青霉胺一种作为螯合剂用于治疗类风湿关节炎和铜中毒的青霉素的分解产物，c5h11no2s
2. channeling effect and blocking effect  
   沟道效应和阻塞效应
3. beneficial effect of forest 
   森林效益
4. effect of defence expenditure 
   国防费支出效果
5. effect of education expenditure 
   教育事业费支出效果

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• 1. 螯合效应
  charge-volume effect 电荷容积效应...chelating effect 螯合效应...chemical binding effect 化学结合效应
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