sliding double change speed wheel

例句：

1. 1. The car has a slidingdouble change speed wheel, which makes iteasy to switch gears.
   这辆车有一个滑动式双速变速轮，这使得换挡变得很容易。
2. 2. The newbike has a sliding doublechange speed wheel, which ismore comfortable for long rides.
   新款自行车有一个滑动式双速变速轮，这对于长途骑行来说更加舒适。
3. 3. Theold car had a sliding double change speedwheel, which was not as smooth asthe new one.
   旧车有一个滑动式双速变速轮，它不如新车那么平滑。