1. Unless the pot is very hot, the temperature of the water will drop too low during steeping for the best extraction. 
   如果茶壶不很热，那么在泡的过程中，水温会降得太低，达不到理想的泡出。
2. countercurrent extraction with reflux 
   回流萃取
3. extraction treatment of wastewater 
   废水萃取处理法
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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