periodic reversal permanent focusing 周期反转永磁聚焦
periodic reversal currentelectrorefining of copper 铜周期反向电解
periodic current reversal 周期反向电流
periodic polarity reversal 周期极性反转
periodic flow reversal reactors 流向变换反应器
If the Earth's magnetic pole reversal caused by biological extinction, it is not difficult to explain why from time to time, so that the periodic destruction of the Earth civilization.
假如地球磁极逆转而造成生物大量灭尽，那就不难表明为何每隔一段时间，使地球文明周期性的毁灭。
The reversal process is not literally periodic as it is on the sun, whose magnetic field reverses every 11 years.
倒转过程不是真正具有像在太阳上那样的周期性，太阳磁场每11年出现倒转。
The existence and uniform boundedness of the global solutions of the model for sulphur dioxide oxidation in a tubular reactor with periodic flow reversal are proved by the invariant domain method.
利用不变区域方法，证明了二氧化硫催化氧化管式反应器流向变换强制操作模型整体解的存在性和一致有界性。
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