Clearly, geophysicists who seek to explain and forecast changes in the field must understand what happens in the outer core.

显然，试图解释和预测磁场变化的地球物理学家必须了解外核发生了什么。

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The Earth's magnetic field is generated as the molten iron of the Earth's outer core revolves around its solid inner core; when surges in the molten iron occur, magnetic tempests are created.

地球磁场是由地球外核的熔铁围绕固体内核旋转而产生的；当铁水激增，就会发生磁暴。

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This metallic core gives Earth its characteristic magnetic field, which has played an extremely important role in the history of our planet.

这种金属核赋予地球特有的磁场，在地球的历史上发挥了极其重要的作用。

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Juniper Networks and Cisco may have had a field day in the core router market cornering over 80% of the market and enjoying a near-duopoly until now but all that might change soon.

FORBES: Juniper Concerned As Alcatel Lucent Targets Core Router Market

In a trading update, the firm said the number of installed core Optos ultra-wide field products had risen by 11% in the year to 4, 700.

BBC: Dunfermline firm Optos eyes strong rise in sales

Dr Pilgrim said that the zoo had been funding the core support facilities a research field camp in the park for more than a decade, but was now becoming directly involved.

BBC: Chester Zoo team on the hunt for new species in Nigeria