gear system

例句：

1. 1. The car's gearsystem is complex and requires careful adjustment.
   这辆车的齿轮系统复杂，需要仔细调整。
2. 2. The newgear system in the car hasgreatly improved its performance.
   汽车中的新齿轮系统大大提高了其性能。
3. 3. The gearsystem on the train is designed to handleheavy loads efficiently.
   火车上的齿轮系统设计用来高效地处理重负载。