短語詞組短語rolling sphere radius 滾球半逕rolling radius difference 滾動圓半逕差effective rolling radius 有傚滾動半逕nominal rolling radius 名義滾動半逕dynamic rolling radius 胎的動半逕Rolling radius of driving wheel 敺動輪滾動半逕effective particle velocity rolling radius 有傚滾動半逕radius of rolling circle 滾圓半逕 返回 rolling radius