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。

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

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自二十世纪初以来，地球物理学家已经了解到地幔像浓汤一样搅动和翻滚。

Since the early twentieth century, geophysicists have understood that the mantle churns and roils like a thick soup.

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“只要我们还在消耗化石燃料，我们就在排放二氧化碳。”哥伦比亚大学的地球物理学家克劳斯· 拉克内说。

"As long as we're consuming fossil fuels, we're putting out CO2," says Klaus Lackner, a geophysicist at Columbia University.

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