地磁倒转
- 网络geomagnetic reversal;magnetic reversal
地磁倒转-
地球上最后一次地磁倒转大约是78万年前。
The last geomagnetic reversal for Earth was about 780,000 years ago .
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你要好好地前前后后想一想不要感情用事！地球上最后一次地磁倒转大约是78万年前。
Take your time and think carefully & don 't get carried away ! The last geomagnetic reversal for Earth was about 780,000 years ago .
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除了有一些以数学模型来证实的理论以外，我们的确不知道地磁倒转的原因。
We don 't really know why but we have some theories that are being borne out in mathematical models .
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地球L地磁历史性的倒转似乎是每几十万年一次，但它的变化范围很大；
The historic reversal rate for Earth seems to be once every few hundred thousand years , but it has varied widely ;