four silent-speed gearbox

例句：

1. 1.The car has a four-speed silent-speed gearbox, which makes it easy to drive in traffic.
   这辆车有一个四速无声变速器，这使得它在交通中驾驶变得容易。
2. 2. The new model of the car has a four-speed silent-speed gearbox, which is more efficient than the previous one.
   这款车的新款有四速无声变速器，比之前的更高效。
3. 3. The four-speed silent-speed gearbox allows the driver to easily switch between different speeds, making driving more comfortable and convenient.
   四速无声变速器使驾驶员可以轻松地在各种速度之间切换，使得驾驶更加舒适和方便。