Computation express that the stiffness indirection in new two spring system have increased.

计算表明：改进后的两系弹簧系统在各个方向的刚度都显著增加。

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The external steel frames are simplified as a series of half frames and the core tube is modeled as a bending and shearing two spring system.

外部钢框架进一步简化为半刚架和相应的弹性阶梯形等效弯曲杆的串联体系，这种简化模型能考虑柱轴向变形对结构动力反应的影响；

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We have a system here of two cars which I connected by a spring.

系统中有两辆车,我将它们用弹簧连接。

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