Inner-planet-gear structure内齿板结构
inner planet gear transmission内齿行星传动
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 driving drum planet gear内行星齿轮
N（名词） any of the planets Mercury, Venus, earth, and Mars, whose orbits lie inside the asteroid belt 内行星