impurity [ɪmˈpjʊrəti]

例句:

• The oxygen reacts vigorously with the impurity in the iron.
  氧气与铁中的杂质发生剧烈的化学反应.
  
• This impurity must be purged away after death.
  这种污秽应该在死后加以净化.
  
• The impurity of supposedly pure subcellular fractions is a constant threat to the plant biochemist.
  以为亚细胞组分很纯而实际不纯的情况,一直是植物化学家感到难办的问题.
  
• That's silica, an impurity, polished by drilling.
  来自NEWYORKER
• It was identified as an impurity in "synthetic heroin".
  来自BBC
• It also may be created as an impurity in production of other pesticides and chemicals.
  来自SA