流动可变性是指每单位时间内的改变，例如河中水的流动或者公司收入和支出的资本流动。
A flow variable represents the change per unit of time, like the flow of water in a river or the flow of revenue and expenses into and out of a firm.
边际贡献率表示销售收入每增加一个单位时边际贡献增加的幅度。
The contribution margin ratio tells the increase in the total contribution margin and operating income for each additional dollar of sales revenue.
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