An apparent or pseudo change in the sign occurs when a stress trajectory passes through an isotropicpoint.
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。
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They point out that the WMAP data clearly show that there are far more hot and cold spots at smaller angular scales, and that it is therefore wrong to assume that the microwave sky is isotropic.