economic service life的用法和樣例：
例句
- Each of these degradations represents an economic life period in a different service.
每一次降級均代表在不同服務崗位上的經濟壽命期。 - To do the calculation, you will have to prepare a spreadsheet table showing all costs after taxes over each investment's economic life.
為了完成計算，你將必須準備一張顯示每種投資在其經濟壽命期間的全部稅後成本的電子表格。
