| 单词 | change gear | 
| 释义 | > as lemmaschange gear   change gear  n. any of a set of gear wheels, each having a different number of teeth, which can be substituted for one another in a gear train in order to vary the speed at which it operates. ΚΠ 1876    Specif. & Drawings Patents 		(U.S. Patent Office)	 21 Mar. 580/1  				By substituting one change-gear for another larger or smaller..the speed of the bobbin increased or diminished. 1948    Pop. Sci. Monthly Dec. 210/2  				The change gears at left may seem conventional. But a few dodges make it possible to switch them in a jiffy. 2008    H. A. Youssef  & H. El-Hofy Machining Technol. v. 195  				The hobbing machine is ordinarily furnished with a complete selection of change gears. < as lemmas | 
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