1. 开慢：change color 变色 | change down 开慢 | change foot 换步

2. change down在线翻译

2. 减速：112. 加速 change up | 113. 减速 change down | 114. 超速 over speed

3.

3. 汽车把变速器换到低档, 开慢：change at 在(某处)换车 | change down 汽车把变速器换到低档, 开慢 | change for 换车往(某处)

4. 降档：change detection 变更检波 | change down 降档 | change drive 变速传动

1. 减挡;挂低速挡
    When you change down, you move the gear lever in the vehicle you are driving in order to use a lower gear.

change down的近义词

    e.g. Changing down, he turned into the drive...
           他减挡拐入了私家车道。
    e.g. I braked at the second corner and changed down to third.
           我在第二个拐弯处踩了刹车，挂上三挡。