sun-and-planet gearing

例句：

1. 1. The new solar systemgearing is designed to improve energy efficiency.
   新的太阳系齿轮设计旨在提高能源效率。
2. 2. The planetary gearing in thespacecraft was carefully adjusted for optimal performance.
   太空船的行星齿轮被仔细调整，以获得最佳性能。
3. 3. Theengineers were taskedwith designing a new gearingsystem for the spacecraft'spropulsion system.
   工程师们被指派负责为太空船推进系统设计一个新的齿轮系统。