单词	roller bearing
释义	roller bearing noun : a bearing in which the journal rotates in peripheral contact with a number of rollers usually contained in a cage — compare ball bearing [roller bearing: 1 outer race, 2 cage, 3 roller, 4 inner race]
随便看	acetovanillone acetoveratrone acetoxime acetoxy acetoxy- acetoxyl acetphenetidin acetract acetum aceturic aceturic acid acetyl acetyl acetylacetonate acetylacetone acetylamino acetylamino- acetylase acetylate acetylation acetylator acetyl benzoyl peroxide acetyl bromide acetylcarbinol acetyl cellulose

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