联立差分方程和补充方程即可求解此类复杂截面的扭转问题，得到扭转剪应力及截面扭转常数。

With these difference equations and compensatory ones, the torsion problem of this kind of beam can be solved to get its torsional shear stress and co.

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从而推得多叶应力区扭转光纤中的超本地模，由超本地模的相位常数来确定该光纤的双折射。

Then, super-local modes in multi-lobe stress region spun fibers can be obtained by using mode transform. Finally, the fiber birefringence is decided from the phase constants of super-local modes.

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