Of all the innerplanets, only Mercury and Earth boast such a field.
在所有的内行星中，只有水星和地球拥有这样一个领域。
2
But, unlike the cores of the innerplanets, 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。
3
Also, because of their relative locations, the four Jovian planets are known as the outer planets, while the terrestrial planets are known as the innerplanets.