稀弄防止裝置 automatic let back motion: 織物稀弄防止裝置back motion: 倒檔; 回程運動friction let-off motion: 摩擦送經(jīng)裝置frictional let-off motion: 摩擦送經(jīng)裝置let off motion: 送經(jīng)運動下載手機詞典可隨時隨地查詞查翻譯