偏心加速度或负加速度旋转时相对于Z轴旋转，反应时缩短。
Compared with Z-axis acceleration and deceleration, the reaction time was shortened during off-vertical axis constant angular acceleration and deceleration.
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。
The acceleration is positive if the speed is increased, negative if speed is decreased.
如果手臂在水中是向前伸展则阻力会随之增加而向后方的反作用力也会出现，二者都会产生负加速度。
If an arm is stretched forward under water resistance is increased and a reaction force back ward is developed both of which would contribute to negative acceleration.
如果手臂在水中是向前伸展则阻力会随之增加而向后方的反作用力也会出现，二者都会产生负加速度。
If an arm is stretched forward under water resistance is increased and a reaction force back ward is developed both of which would contribute to negative acceleration.
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