| 1. | Magnetic field polarity reversals are magnetic poleshifts
磁场极性逆转就是磁极转换。 |
| 2. | Magnetic minerals trapped inside ancient rocks have recorded hundreds of these so - called polarity reversals in the past 500 million years
在地磁反转后，指北针的指针会指向南极，而不再是冰冻的北极。 |
| 3. | These efforts are providing an intriguing explanation for how polarity reversals occurred in the past and clues to how the next such event may begin
这些工作，对于过去的磁极反转提出了一套很有意思的解释，更对下一次的反转事件将如何展开，提供了新的线索。 |
| 4. | Despite the inherent limitations , several noteworthy observations came out of these efforts , including hints about the possible onset of a new polarity reversal
尽管在此既有限制之下，研究人员仍然得到了许多重要的观测结果，包括关于磁极可能开始反转的线索。 |
| 5. | This paper introduces the formation of magnetic field , polarity reversal , secular variation and the use of geomagnetic polarity reversal or susceptibility in stratigraphic study
摘要本文介绍了地球磁场的成因、极性变化以及运用极性倒转划分对比地层和指示环境。 |
| 6. | Computer - generated polarity reversals provided researchers with the first rudimentary glimpse of how such switches may originate and progress [ see box on next page ]
电脑所模拟的磁极反转，让研究人员首次能对于此转换过程的开始及演进可以有初步了解（见下页模拟磁极反转） 。 |
| 7. | Now several programs can simulate not only motion but even polarity reversals , some of which require only 1 , 200 years ? a wink of geologic time
现在，有些程式不只能模拟地核运动，甚至能计算地磁的反转，从模拟实验中发现，有些地磁反转事件只需要短短的1200年就可以完成，不过是地质时间上一眨眼间的事。 |
| 8. | But we do have convincing information obtained from magnetized mineral grains in rocks that tells us that geomagnetic polarity reversals have occurred a great many times in the history of the earth
但是我们确实从岩石破磁化的矿物颗粒中获得了令人信服的信息，这个信息告诉我们在地球史上曾发生了很多次地磁极性倒转。 |
| 9. | For an actual planetwide polarity reversal to occur , such a reversed flux patch would grow and engulf the entire polar region ; at the same time , a similar change in overall regional magnetic polarity would take place near the other geographic pole
如果整个行星的磁极要真的反转，反向通量斑块需扩大到涵盖整个极区；同时，另一个地理极点附近也会发生类似的区域极性全面变化。 |
