也许我们应该吸取经验教训，例如频繁性地震就是一个警钟，异常天气变化，更糟的居住形势。
Maybe we should learn lessons form the alarms such as frequent Earthquake, abnormal weather, worse habitation.
1991年以来的地壳运动趋势分析，对判断该区域的应力状态和地震大形势具有一定的参考意义。
The analysis of the crustal movement tendency since 1991 have some significance for the judging stress state and large seismic situation in the area.
从区域性地震群体活动的韵律性、分幕性及环境因子对地震发生的作用入手，研究了华北地震总形势。
At first from rhythmic rules and episodes of regional seismicity and influence of environment factors on earthquake occurrence, the overall tendency of seismic activity have been studied.
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