inner planet gear 内侧行星齿轮
inner planet geear 内侧行星齿轮
inner planet gearing 内齿行星传动
Inner-planet-gear structure 内齿板结构
N any of the planets Mercury, Venus, earth, and Mars, whose orbits lie inside the asteroid belt 内行星
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。
Mercury is the only inner planet 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。
The dividing line between the bright and shaded regions of the disk of the moon or an inner planet.
明暗界线：月亮或内行星亮和暗的区域之间的分界线。
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