cog·wheel /ˈkɑgˌhwil, ˌwil/
鈍齒輪,木齒鐵輪
Cog·wheel n. A wheel with cogs or teeth; a gear wheel. See Illust. of Gearing.
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cogwheel
n : a toothed wheel that engages another toothed mechanism in
order to change the speed or direction of transmitted
motion [syn: gear, gear wheel]