在以往的教科书中，地球的内部如地幔和地核被描述成简单而几乎相似的区域。
In the textbooks of yore, the Earth's inner regions like the mantle and core were presented as simple, fairly homogeneous regions.
与此同时，该卫星还通过研究恒星表面发生的星震来探测其内部情况，正如地质学家研究地震来了解地球的内部构造。
Thespacecraft is also probing the interiors of stars by studying starquakes ontheir surfaces—in much the same way that geologists learn about the Earth'sinterior by studying earthquakes.
事实上，海平面会根据地球不规则的内部而变化。
In reality, sea level varies according to the irregular interior of the planet.
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