1. rotary plunger vacuum pump 
   滑阀真空泵
2. inertial coupling in rapid roll 
   急滚惯性耦合
3. magnetic coupling mechanism and Schatzman mechanism 
   磁耦合机制和沙兹曼机制
4. A pipe coupling threaded on both ends. 
   螺纹接头一种两端都带外螺纹的管子
5. One that dashes, especially the plunger of an ice-cream freezer. 
   猛冲者猛冲的人或物，尤指冰淇淋凝固搅拌器

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• 1. 滑动套万向接头
  plunger core machine 挤芯机...plunger coupling 滑动套万向接头...plunger crank 柱塞传动曲柄
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