accelerationsn.加速；加速度（acceleration的复数形式）accelerationn.加速；促进；加速度acceleration of particles粒子加速acceleration time history加速度时程acceleration of vibration振动加速度Acceleration responsivity加速度acceleration of inflation通货膨胀加速acceleration misalignment加速角误差acceleration distribution加速度分布acceleration deactivation催速失活acceleration of sintering促进烧结acceleration in the rates加快速度

1. The second time derivative is the constant acceleration.
   它的二阶导数就是这个恒加速度。