When a swimmer slows and then finally applies forces there are stages of slowing down (the correct term is negative acceleration not deceleration) and speeding up (the correct term is positive acceleration not acceleration).

• 当游泳运动员慢下来然后增加力量以求得继续前进时会有不同的阶段，这就是减速阶段（正确用语是负加速度而非减速）和加速阶段（正确用语是正加速度而非加速）。