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.
随便看	fall (or get) into the wrong hands fall out fallout fallout shelter fall over oneself to do something fallow fallow deer fallowness fall prey to fall prey to (also be or become prey to) Fall River fall short (of) fall through fall to fall to pieces fall to someone's lot fall victim to Falmouth false false acacia false alarm false arrest false bedding false bottom false card

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