“polarity reversal”簡單造句，polarity reversal造句子

This paper introduces the formation of magnetic field, polarity reversal, secular variation and the use of geomagnetic polarity reversal or susceptibility in stratigraphic study.

Magnetic minerals trapped inside ancient rocks have recorded hundreds of these so-called polarity reversals in the past500 million years.

If a cell does get fully drained, though, it can go into a state known as polarity reversal, in which the surrounding good cells drive the bad one in reverse.