所述的多棱针为三棱针。

The multi-edged needle is a three-edged needle.

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外侧加力，三棱针刚度最小，残余变形居中。

Lateral loading, the rigidity of triangular needle was smallest, its rem-nant deformation was medium.

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外侧加力，三棱针刚度最小，残余变形居中。

Lateral loading, the rigidity of triangular needle was smallest, its rem-nant deformation was medium.

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