But, unlike the cores of the inner planets, the Moon's core contains little or no iron, while the typical planet-forming materials were quite rich in iron.
但是，与内行星的核心不同，月球的核心几乎不含铁，而典型的行星形成物质则富含铁。
2
Mercury is the only innerplanet besides Earth with global magnetic field.
除了地球以外，水星是唯一的一个拥有球星磁场的地球型惑星。
3
The dividing line between the bright and shaded regions of the disk of the moon or an innerplanet.