有证据表明，外地核的密度约为地幔物质的两倍。
Evidence indicates that the outer core is about twice as dense as the material in the mantle.
因此，眼球构造可能是外地核向地幔释放氧，下地幔内存在氧元素的历史记录。
The eyeball structures might have recorded the history of oxygen activity in the mantle and the Earth's core.
因此，眼球构造可能是外地核向地幔释放氧，下地幔内存在氧元素的历史记录。
The eyeball structures might have recorded the history of oxygen activity in the mantle and the Earth's core.
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