求翻译：现在我们知道地球的历史有46亿年，而我们能够追溯到最早的地磁场是30多亿年，30多亿年以前有没有现在还没有确切的证据，也可能有，在这30多亿年以来，地球发生过成百上千次倒转，所以倒转不是什么可怕的事，也不是什么了不得的事。是什么意思？

Now we know the history of the Earth 4.6 billion years, and we can be traced back to the earliest of the geomagnetic field is more than 30 billion years, there is no more than 30 million years ago is still no conclusive evidence, there may be more in this 30 billion years since the Earth hundreds of

Now we know that the earth is 4.6 billion years old, and we were able to trace back to the earliest of the magnetic field is 30 to more than 100 million years, more than 30 100 million years ago have now also do not have an exact evidence, it is also possible that there are, in more than 30 100 mill

正在翻译，请等待...

We now know that the Earth is 4.6 billion years of history, and we can date back to the earliest magnetic fields are more than 3 billion years, no more than 3 billion years before now there is no conclusive evidence, there may also be, since in more than 3 billion years, the Earth happened hundreds

Now we knew Earth's history has 4,600,000,000 years, but we can trace the earliest earth magnetic field are more than 30 hundred million years, more than 30 hundred million years before has the present not to have the accurate evidence, also possibly has, since in this more than 30 hundred million y