求翻译：由于电磁热裂纹止裂是极端条件下的相变过程，裂纹尖端相变区域是在磁场和热应力共同作用下发生的相变，所以经典的相变动力学公式4不适用于此过程。是什么意思？

Electromagnetic thermal crack arrest under extreme conditions of the phase transition process, the crack tip phase transition region is the phase change under the combined effect of the magnetic field and thermal stress, so the classic formula of phase transformation kinetics does not apply to this

As for electromagnetic heat cracks crack under extreme conditions is the phase-change process, cracks leading-edge phase-change in the magnetic field is a region and the thermal stress common role of phase change, so classic phase change dynamics formula 4 does not apply to this process.

Because the electromagnetism heat crack stops the crack is under the extreme condition changes the process, the crack acme changes the region is occurs in the magnetic field and under the thermal load together function changes, therefore the classics change mechanics formula 4 not to be suitable for

Because of thermal crack under extreme conditions of electromagnetic phase change process, phase-change region is near the crack tip in a magnetic field and phase transition that occurs under thermal stress, so classical phase transition dynamics of formula 4 does not apply to this procedure.

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