Including: rope, spring wire, steel wire cutter, carbon spring wire.

包括：钢丝绳、弹簧丝、钢绞丝、碳素弹簧丝。

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Because the diameter of the steel wire forming the spring by winding is changed along the axial direction of the steel wire, the spring can obtain a variable stiffness characteristic curve.

由于卷绕构成弹簧的钢丝的直径沿钢丝的轴向改变，因此弹簧可以获得变刚度的特性曲线。

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