单词	idler wheel
释义	idler wheel noun also idle wheel : a wheel or roller used to transfer motion or to guide or support something: as  a. : idler gear  b. : idler pulley  c. : a rubber-surfaced roller in a sound-recording or sound-reproducing mechanism for transferring power by frictional means (as from the motor shaft to the turntable rim in a phonograph) [idler wheel 1]
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