弓弦式桁架;弓弦桁架

bowstring truss的用法和样例：

例句

For a complanate parallel chords truss, the axial forces of a member can be solved by the shear-diagram and two simple expressions.借助与桁架对应的梁的剪力图和弯矩图根据两个关系式可直接求出一般平面平行弦桁架任一根杆件的轴力。

成语故事:惊弓之鸟

In the Warring States Period, there was a man in the State of Wei called Geng Lei. One day he said to the king，I can shoot down birds by simply plucking my bowstring.' When the king expressed doubt, Geng Lei pointed his bow at a wild goose flying i

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