短语词组短語point of suspension 懸點;懸吊點Three -point rear suspension 三點後懸掛two point suspension scaffold 兩點懸掛架空腳手板single -point suspension 單點懸掛裝置four point suspension spreader 四點吊吊具point and flat suspension 尖杆平座式懸掛 返回 point suspension