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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Also, there will be need to discuss the various factors determining prices in relation to change in quantity demanded and change in demand of personal computers.

此外，将需要讨论的各种因素决定价格的变化在数量上的需求和变化的个人电脑的需求。

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If we calculate the change in entropy during gas mixing, we will find that this quantity is positive.

如果我们计算气体混合过程中熵的变化，我们会发现这个量是正的。

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As long as we understand that, we can do this cancellation and this says on the left-hand side the change in the quantity v square over 2 is a times the change in the quantity x.

只要我们明白这一点,我们就可以这样做简化,在等号左边,v^/2的变化量,为a乘以x的变化量

耶鲁公开课 - 基础物理课程节选

First off, it assumes zero change in the quantity of goods.

FORBES: The Real Impact of Quantitative Easing (Next to Nothing!)

As the whole point of Quantitative Easing and the government stimulus was to raise output and employment (because, for those who have not noticed, we have almost 14 million citizens looking for work), there is no reason to maintain the assumption of zero change in the quantity of goods.

FORBES: The Real Impact of Quantitative Easing (Next to Nothing!)

The fact that a 21 percent increase in the value of the Yuan was met with a 38.7 percent increase in import value means that the quantity of Chinese imports demanded increased by nearly 15 percent after the price change.

FORBES: Economists Ignore the Facts in Supporting Chinese Currency Legislation