1. pericoronitis of wisdom tooth 
   牙咬痈
2. Extract a wisdom tooth. 
   拔出一颗智齿
3. extraction treatment of wastewater 
   废水萃取处理法
4. loss of sensation in a small area of the body (as when a local anesthetic is injected for a tooth extraction). 
   身体一小部分失去知觉。
5. extraction and metallurgy of thorium 
   钍的提炼

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