地磁场倒转和长期变的理论、观测和应用以及磁性地层学；
Theory, observation and application of the geomagnetic polarity reversal and secular variation, magnetostratigraphy;
尽管在过去地质时期地磁场发生了多次倒转，但要预测下次倒转将在何时发生也还是不可能的。
Although magnetic reversals have occurred many times in the geologic past, it is not yet possible to predict when the next reversal will occur.
所以现在，我们已经初次具有了有关磁场怎样能发生倒转的三维和随时间变化的模拟信息。
So now, for the first time, we have three-dimensional and time-dependent simulated information about how magnetic reversals can occur.
这是不可能的时钟倒转，但它可能提供电磁场保护我们自己和我们的孩子。
It is not possible to turn back the clock, but it is possible to provide EMF protection for ourselves and our children.
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 reversal process is not literally periodic as it is on the sun, whose magnetic field reverses every 11 years.
为了发生一次倒转，必须有一个很短的时间没有磁场存在。
In order for a reversal to take place there must be a brief time during which the field is non - existent.
为了发生一次倒转，必须有一个很短的时间没有磁场存在。
In order for a reversal to take place there must be a brief time during which the field is non - existent.
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