impurities [ɪm'pjʊərɪtɪs]

例句:

• Once its impurities had settled, the oil could be graded.
  一旦杂质沉淀下去，油就可以分级了。
  
• A filter will remove most impurities found in water.
  过滤器会滤掉水中的大部分杂质。
  
• Oil is refined to remove naturally occurring impurities.
  油经过提炼去除天然存在的杂质。
  
• Subaru pays that company to take the impurities off its hands.
  来自WSJ
• Like so many things, impurities are what makes it fascinating.
  来自SA
• Skim off any scum and impurities that rise to the top.
  来自THETIMES