单词：planet gear
planet gear的用法和样例：
例句
- 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。
- 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。
- planet wheel行星轮,行星齿轮...
- epicyclic gear行星齿轮
- planetary gear行星齿轮
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