secondary sun wheel

• 第二太阳齿轮

secondary sun wheel的用法和样例：

例句

1. The bike chain drives a sun gear on the rear axle, which transmits power to planetary gears situated around it.
   自行车的链条会驱动后轮轮轴上的太阳齿轮，将动力传送到四周的行星齿轮。