单词	roller bearing
释义	roller bearing noun 1A bearing similar to a ball bearing but using small cylindrical rollers instead of balls.With a roller bearing instead of having a contact point that is only a spot, you have an entire strip running along the width of the bearing.... Many bearings look very similar, whether they are ball bearings, roller bearings or other bearings. The roller bearing is there to prevent the round from shifting forward in the magazine. 1.1A roller used in a roller bearing.
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