principle of virtual work的用法和樣例：
例句
- Then, the principle of virtual work is used to derivate the equilibrium condition of CM.
在以上基礎上，應用虛功原理，推導出柔性機械穩態的條件。 - On the principle of the deformation work this paper words out a very simple method for approximate calculation of the extrusion force in the metalic plastic extrusion processes.
運用變形功原理，推導出求金屬塑性擠壓過程中擠壓力的一種極其簡捷的近似計算式。
