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。

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

youdao

每年，就像某些神奇的发条装置一样，它能以越来越少的成本做越来越多的事情；由于大规模消费的存在，技术的单位边际成本渐趋于零。

And every year, like some sort of magic clockwork, it does more and more for less and less, bringing the marginal costs of technology in the units that we individuals consume closer to zero.

youdao

比如，你的日常开支费用是1000美元，单位边际收益是10美元，那么你的收支平衡数量就是1000美元/10美元，或者100件。

For example, if your overhead costs were $1,000 and your contribution margin from each unit you sell is $10, then your break-even in units would be $1000/$10 or 100 units.

youdao