短語詞組短語spur gear wheel 正齒輪spur friction wheel 筒形摩擦輪spur geared wheel reductor 外嚙合圓柱齒輪式輪邊減速器spur -wheel reversing gear 正齒輪回動裝置Double width spur wheel 加寬直齒輪spur wheel countershaft 正齒輪副軸spur wheel gear 正齒輪transmission spur wheel 傳動正齒輪 返回 spur wheel