1. The wolf lose his tooth, but not his instinct. 
   狼牙虽失，本性难移。
2. gearing with the thread of a worm. 
   带有螺纹线的传动装置。
3. The gearing of this machine is unusual. 
   这机器的齿轮装置很特别。
4. planetary gearing with small difference between the numbers of teeth 
   少齿差行星齿轮传动
5. Draw out a tooth 
   拔牙

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