1. countercurrent extraction with reflux 
   回流萃取
2. extraction treatment of wastewater 
   废水萃取处理法
3. To make an exhaustive search. 
   进行彻底搜查
4. extraction and metallurgy of thorium 
   钍的提炼
5. extraction and purification of uranium 
   铀的提取和纯化

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• 1. 极限抽提
  ether extraction 醚抽出物(粗脂肪量)...exhaustive extraction 极限抽提...feature extraction 特征抽出
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