invariable cost的用法和樣例：
例句
- Variable Cost A cost that changes in proportion to a change in a company's activity or business.
可變成本隨著(zhù)公司活動(dòng)或業(yè)務(wù)變動(dòng)而變動(dòng)的成本項目。 - Instead, advertising becomes a variable cost of production that measurably results in making more profit.
現在，廣告變成了能夠帶來(lái)更多利潤的產(chǎn)品的可測定的可變成本。
