单词	stackfreed
释义	stackfreed noun stack·​freed ˈstakˌfrēd plural -s : an eccentric wheel or cam having a spring pressing on it and formerly attached to the barrel of the earliest mainspring-driven timepieces to equalize the force transmitted Word History Etymology origin unknown
随便看	perker perkest perkier perkiest perkilier perkiliest perkily Perkin reaction perkin synthesis perkin's purple perkin's violet perkiness perkinesses perking perking (up) perking up Perkins perkins Perkinsiella perks perks (up) perks up perky Perl Perla

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