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单词 ball bearing
释义 ball bearing
 —ball-bearing,  adj.  
 Mach.
  1. a bearing consisting of a number of hard balls running in grooves in the surfaces of two concentric rings, one of which is mounted on a rotating or oscillating shaft or the like.
  2. any of the balls so used.
 [1880-85]
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更新时间:2024/11/11 17:55:50