在沙罗周期系列中相继发生的日全食的路径每隔18年作有规律的图形变化。
The paths of totality for successive eclipses in this saros series change in a regular pattern every 18 years.
本文就此进行了初步分析，认为强震前的预滑移可能产生这种长周期的形变波，它们对大震预报有一定意义。
In this paper we analyze these data and find that the deformation wave of long period comes from pre-movement before a strong earthquake.
当一束聚焦的、调制的激励激光照射固体材料时，表面上除了产生周期性的温度分布，还产生局部的周期性形变。
When a focused, modulated exciting laser beam incidents onto a solid surface, besides generation of periodical temperature distribution, a periodical local surface deformation also occurs.
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