It is the rate of change in total utility per unit change in quantity and is not the utility of a marginal unit.

它是（商品）量的每单位变动带来的总效用变动率，而不是边际单位的效用。

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Reaction rate is measured by the change in concentration of a reactant or product per unit time.

反应速率是指单位时间里反应物或生成物浓度的变化。

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Tests was carried out on cookies both in single and package unit to measure its velocity change and acceleration in different orientation in different damage rate based on damage boundary theory.

以苏打饼干单片和单包为研究对象，应用破损边界理论，设计相关实验，测试饼干在不同破损率条件下各个方位的速度变化及加速度，构造出饼干的破损边界曲线。

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What really matters for jobs and competitiveness is not consumer price inflation, but the rate of change of unit labor costs. (Unit labor costs are wage rates adjusted for changes in productivity.) A recent study from the Boston Consulting Group suggests that Chinese unit labor costs will grow at about 8.5 percent per year over the next five years.

FORBES: Chuck Schumer and the China Currency Bill