以下为句子列表：
英文: The contribution margin approach uses the product's unit con-tribution margin of its contribution margin ratio, which give the increase in operating income for each additional unit sold or for each dollar of sales revenue, respectively.
中文: 边际贡献法使用产品的单位边际贡献或他的边际贡献率，即销售量或销售额每增加一个单位时边际贡献的增长幅度。
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