The drive shaft is able to contract, expand, and change operating angles while transmitting torque through the use of universal joints and slip joints.
在万象头和伸缩接头的应用下，传动轴还能进行收缩，伸展或改变运行角度等方式来传递扭矩。
2
Slip of a prop changes with operating conditions, and is not a direct measure of efficiency.
打滑的支柱与操作条件的变化，是没有效率的直接测量值。
3
Influence of ceramic slip properties, plaster mould properties, operating conditions etc. on absorption slip rate of ceramic slip are investigated. Experiments prove that the factors are complicated.