污染

• Pollution, however, hastens the natural rate of aging .
  然而，污染却能加速老化自然演变速度。
• Is the water polluted at source or further downstream ?
  河水是在源头还是在流出之后受到污染的？
• Casts are usually soiled either during eating or elimination .
  在喂食或排泄时管型经常受到污染。
• The public insist that pollution control measures be installed .
  公众坚决主张采取控制污染的措施。
• Power plants that burn coal add greatly to air pollution .
  燃煤的发电厂大大地加重了空气的污染程度。
• Soot fouls the air .
  烟屑污染空气。
• Seepage from land fills can pollute ground water or surface water .
  填土的渗漏可能污染地下水和地面水。
• Pollution shortens considerably the life expectancy of a body of water .
  污染使水体的估计寿命大为缩短。
• The role of dopants and contaminants in degradation cannot be ignored .
  杂质和污染对退化的作用不能忽视。
• It is important to take stringent precautions against contamination in the lab .
  必须特别注意实验室的污染。