real cost的用法和樣例：
例句
- Price is seldom determined by what the supplier believes is the true cost.
價格很少由供應商所認為的真實成本決定。 - An oft-cited example is the massive stack of paperwork handed to mortgage borrowers at closing, including several calculations of the true cost of the loan itself.
一個廣受詬病的例子是，成交時需要向抵押貸款借款人提交極大量的文件，其中包括對貸款本身的真實成本的幾種計算結果。
