• 1. 外定位环: outer ring
• 2. 六元环环外定位效应: Six-membered cyclic transition state

• 1.轴承环磨削过程中，以轴承环外径作为定位基准，在电磁无心夹具上磨削轴承环外滚道。
  When grinding the bearing ring, the outside diameter of it was taken as locating datum to process the outer raceway with the assistance of electromagnetic centerless clamper.
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