magnetic polarity reversal

基本解释

The magnetic polarity reversal record is often illustrated by means of a column with black and white intervals depicting the two polarity.
地磁極性反轉記錄通常用代表兩種極性的黑白間隔所組成的極性柱來表示。
The magnetic polarity reversal polarity reversal record is often illustrated by means of a column with black and white intervals depicting the two polarity.
地磁板性反轉紀錄通常用代表兩種極性的黑白間隔所組成的極性柱來表示。
geology.nju.edu.cn
They claim a relationship between the rotation and the magnetic polarity of Earth, which does change irregularly, with a magnetic reversal taking place every 400,000 years on average.
他們聲稱地球磁極和自轉有關系。地球的磁極的確會不槼律的改變，大約平均400，000年發生一次磁極轉換。