1. countercurrent extraction with reflux 
   回流萃取
2. extraction treatment of wastewater 
   废水萃取处理法
3. extraction and metallurgy of thorium 
   钍的提炼
4. extraction and purification of uranium 
   铀的提取和纯化
5. extraction of confession by torture 
   刑讯逼供

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• 1. 尿素抽提
  ultrasonic extraction 超声波抽提...urea extraction 尿素抽提...vacuum extraction 真空抽提
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