| 单词 | friction-ball |
| 释义 | > as lemmasfriction-ball friction-ball n. one of the balls used to lessen the friction of bearings, etc. ΘΚΠ society > occupation and work > equipment > machine > parts of machines > other parts > [noun] > parts for reducing friction bearing1734 friction-wheel1772 friction-roller1793 friction-ball1813 cylinder1819 screw-down1864 ball bearing1867 needle roller1935 1813 Weekly Reg. 4 111/2 The wheels of both boats and carriages are provided with double ratchets reversed, or friction cups and balls. 1842 G. W. Francis Dict. Arts Friction balls. < as lemmas |
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