pony truss的用法和樣例：
例句
- The correctness and validity of this method were made clear by the mechanism synthesis of the octahedron variable geometry truss.
八面體變幾何桁架機構綜合實例表明了該方法的正確性與有效性。 - For a complanate parallel chords truss, the axial forces of a member can be solved by the shear-diagram and two simple expressions.
藉助與桁架對應的梁的剪力圖和彎矩圖根據兩個關係式可直接求出一般平面平行弦桁架任一根桿件的軸力。
