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	running water running wheel runny runoff run off runoff runoff primary run off with run of mine run-of-mine run-of-paper run-of-river run-of-the-mill run-of-the-mine runological runologist runology run on run-on run-on couplet run-on sentence runout runout run out run-out groove

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