每个人来到世上，其实都是在完成生命的一本书，这本书在它不同阶段的历程中，由不断加长的辐射线渐渐变成螺旋形。

Each one comes here to finish but one book of life, which, during the progress of its various parts, grows spiral-wise on an ever-increasing radius.

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则螺旋线平衡的动态稳定性由时间域的本征值判断。

Then the dynamic stability of the helical equilibrium depends on the eigenvalues in the time domain.

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目的：本实验主要研究不同螺旋输送器、根管数目和操作者熟练度对桩核印模成功率的影响。

Objective:The aim of this stud was to evaluate the effect of types of lentulo the numble of root canals and operator's skill on the success rate of post impression.

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