说明地磁异常变化是一种有希望的地震前兆现象。
It indicated that the geomagnetic anomaly is a promising phenomenon in the studies of earthquake precursors.
由此可见，动物的行为异常确是一种在临震前出现的宏观前兆现象。
So we suppose that the unusual behavior of animals is possibly a short-term macroscopic premonitory phenomenon of the earthquakes.
地震前兆观测异常信号识别是前兆研究的基础，但是前兆现象的识别始终存有较大争议。
Recognizing earthquake precursor signals is the basic of precursor research. But there are some disputes still.
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