marginal cost and revenue

例句：

1. 1.The company's marginal cost of production is $5 per unit.
   这家公司每单位产品的边际生产成本是5美元。
2. 2.The marginal revenue curve shows how the price changes with quantity.
   边际收益曲线显示了价格随数量变化的情况。
3. 3. To maximize profits, a business must consider both its marginal cost and revenue.
   为了最大化利润，一个企业必须考虑它的边际成本和收入。