close-ratio gearbox

例句：

1. 1.The new car has a close-ratio gearbox that makes it more efficient.
   这款新车配备了紧密比齿轮箱，使其更加高效。
2. 2. The engineers worked hard to design a close-ratio gearbox that could withstand heavy loads.
   工程师们努力设计了一个能够承受重负载的紧密比齿轮箱。
3. 3. The company's latest model uses a close-ratio gearbox to improve fuel efficiency.
   该公司的最新型号使用了紧密比齿轮箱来提高燃油效率。