It may also have a core, as the earth does.
月球也可能如同地球一样有一个地核。
The magnetic core of the Earth is moving, literally changing directions inside the Earth.
地球核心的磁场正在移动，不加夸张地说，地球内部的方向在发生变化。
The earth has a core and a mantle around it.
地球的中心是地核，地核的周围是地幔。
Internally the earth consists of two parts, a core and a mantle.
地球的内部由两部分组成：地核和地幔。
Internally the earth consists of two parts, a core and a mantle.
地球的内部由两部分组成：地核和地幔。
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