滑环 Traditional form: 滑環 Pinyin (reading): huáhuán Definitions: slip ring collector ring (electrical engineering) Characters: 滑 - to slip, to slide; slippery, polished 环 - bracelet, ring; to surround, to loop Traditional characters: 滑 - to slip, to slide; slippery, polished 環 - bracelet, ring; to surround, to loop