This factor has been dubbed "the second derivative", or the rate of change of the rate of change.

这一因素被称为是“二阶导数”，或者是变化率的变化率。

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The force and moment exerted on the solid body are expressed as the rate of change of the first-and second-order kinetic vorticity moments, respectively.

作用在任意运动物体（系）上的力和力矩可以分别表示成流场中动力学涡量的一阶矩和二阶矩随时间的变化率。

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After training of disinfection worker, repair of sprayers and change of disinfectants, the eligible rate of disinfection in second drill was 100%(240/240).

经过培训消毒员、维修喷雾器和更换消毒剂，第2次演练的消毒合格率为100%（240/240）。

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The second change is that, in return for agreeing to a reduction in the corporate tax rate, the Ministry of Finance is closing a number of loopholes.

ECONOMIST: Worse to come