1. Sewage itself is another major contaminant of water that can cause ecological problems and such human diseases as cholera and dysentery. 
   污水是引起水体污染的另一个重要因素，它会导致一些生态问题，使人引发霍乱和疟疾。

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• 1. 污染物
  污染 contamination...污染物 contaminant...菌株 strain
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• 2. 杂质
  contaminant in fuel oil 燃料油中的污染物...contaminant 杂质...contaminated air 污染空气
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• 3. 污染物，杂质
  containment facility 防范设施...contaminant 污染物，杂质...contamination 污染，沾污
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• 4. 沾染物质
  contactless scribing 无接触划片...contaminant 沾染物质...contaminant free film 无沾污膜
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