all-silent gearbox

例句：

1. 1.The all-silent gearbox makes it easy to shift gears without making a sound.
   全静音变速箱使得换挡时不发出声音。
2. 2. The new car has an all-silent gearbox that reduces engine noise.
   这款新车配备了一个全静音变速箱，可以降低发动机噪音。
3. 3. The all-silent gearbox is designed for quiet driving in urban areas.
   全静音变速箱是为城市地区提供安静驾驶而设计的。