plane gear

• 行星齿轮； 动针轮

plane gear的用法和样例：

例句

1. Planetary gear systems are also used in many automatic transmissions.
   行星齿轮组也同样用于许多汽车变速器中。
2. 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。