况且随着杆件及运动参数的变化，其运动形式千变万化。
With variation of parameters and motion rod, its motion is volatile.
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小尺寸和表面效应也是导致纳米杆应变刚化的原因。
Small size and surface effects also lead to the strain-stiffening effect.
平面桁架是一种自然离散化的杆系结构。
The plane truss is a natural dispersed.
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模块上移
模块下移
不移动