negative acceleration

• 负加速度

negative acceleration的用法和样例：

例句

1. The acceleration is positive if the speed is increased, negative if speed is decreased.
   速度增加的加速度为正加速度，速度减少的加速度为负加速度。
2. He is as much interested in slowing down or in deceleration as he is in acceleration.
   他同样对减速或者说一如他对加速那样对减速感兴趣。