当一个主应力迹线通过一个各向同性点时，该符号会发生一个表面上的或虚假的改变。
An apparent or pseudo change in the sign occurs when a stress trajectory passes through an isotropic point.
利用对应原理和FFT技术计算出了无限均匀各向同性介质中双力偶点源产生的位移场，并结合若干实例进行了分析和总结。
According to the correspondence principle and FFT, the author have calculated the displacement field of a double-couple point source in homogeneous, isotropic, unbounded medium.
基于四角切圆燃烧锅炉炉内湍流流动各向同性的假设，得出炉内各点的特征频率。
On the basis of a hypothesis that the turbulent flow in a tangentially fired boiler furnace assumes an isotropic character obtained is the eigenfrequency of various points within the furnace.
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