reversal of polarity

• 极性反转

reversal of polarity的用法和样例：

例句

1. Elongating the time of polarity reversal can reduce the field strength under polarity reversal.
   延长极性反转时间可降低极性反转时的场强。
2. Magnetic field polarity reversals are magnetic poleshifts.
   磁场极性逆转就是磁极转换。